| kspaceFirstOrder3D-OMP 1.1 The C++ implementation of the k-wave toolbox for the time-domain simulation of acoustic wave fields in 3D

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HDF5_File.h File Reference

The header file containing the HDF5 related classes. More...

`#include <hdf5.h>`
`#include <hdf5_hl.h>`
`#include <string>`
`#include <map>`
`#include <Utils/DimensionSizes.h>`
Include dependency graph for HDF5_File.h:
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

## Classes
class | THDF5_File
| Class wrapping the HDF5 routines. More...
class | THDF5_FileHeader
| Class for HDF5 header. More...

## Detailed Description

Author
  Jiri Jaros
  Faculty of Information Technology
  Brno University of Technology
  jaros.nosp@m.jir@.nosp@m.fit.v.nosp@m.utbr.nosp@m..cz

Version
  kspaceFirstOrder3D 2.15

Date
  27 July 2012, 14:14 (created)
  02 October 2014, 12:45 (revised)

# HDF5 File Structure

The C++ code has been designed as a standalone application which is not dependent on MATLAB libraries or a MEX interface. This is of particular importance when using servers and supercomputers without MATLAB support. For this reason, simulation data must be transferred between the C++ code and MATLAB using external input and output files. These files are stored using the Hierarchical Data Format HDF5 (http://www.hdfgroup.org/HDF5/). This is a data model, library, and file format for storing and managing data. It supports a variety of datatypes, and is designed for flexible and efficient I/O and for high volume and complex data. The HDF5 technology suite includes tools and applications for managing, manipulating, viewing, and analysing data in the HDF5 format.

Each HDF5 file is a container for storing a variety of scientific data and is composed of two primary types of objects: groups and datasets. A HDF5 group is a structure containing zero or more HDF5 objects, together with supporting metadata. A HDF5 group can be seen as a disk folder. A HDF5 dataset is a multidimensional array of data elements, together with supporting metadata. A HDF5 dataset can be seen as a disk file. Any HDF5 group or dataset may also have an associated attribute list. A HDF5 attribute is a user-defined HDF5 structure that provides extra information about a HDF5 object. More information can be obtained from the HDF5 documentation (http://www.hdfgroup.org/HDF5/doc/index.html).

kspaceFirstOrder3D-OMP v1.1 introduces a new version of the HDF5 input and output file format. The code is happy to work with both versions (1.0 and 1.1), however when working with an input file of version 1.0, some features are not supported, namely the cuboid sensor mask, and u_non_staggered_raw. When running from within the actual K-Wave Toolbox, the files will always be generated in version 1.1

The HDF5 input file for the C++ simulation code contains a file header with brief description of the simulation stored in string attributes, and the root group `/' which stores all the simulation properties in the form of 3D datasets (a complete list of input datasets is given bellow). The HDF5 checkpoint file contains the same file header as the input file and the root group `/' with a few datasets keeping the actual simulation state The HDF5 output file contains a file header with the simulation description as well as performance statistics, such as the simulation time and memory consumption, stored in string attributes. The results of the simulation are stored in the root group `/' in the form of 3D datasets.

    ==============================================================================================================
                                            Input File/Checkpoint File Header
    =============================================================================================================
    created_by                              Short description of the tool that created this file
    creation_date                           Date when the file was created
    file_description                        Short description of the content of the file (e.g. simulation name)
    file_type                               Type of the file (input)
    major_version                           Major version of the file definition (1)
    minor_version                           Minor version of the file definition (1)
    ==============================================================================================================

    ==============================================================================================================
                                            Output File Header
    ==============================================================================================================
    created_by                              Short description of the tool that created this file
    creation_date                           Date when the file was created
    file_description                        Short description of the content of the file (e.g. simulation name)
    file_type                               Type of the file (output)
    major_version                           Major version of the file definition (1)
    minor_version                           Minor version of the file definition (1)
    -------------------------------------------------------------------------------------------------------------
    host_names                              List of hosts (computer names) the simulation was executed on
    number_of_cpu_cores                     Number of CPU cores used for the simulation
    data_loading_phase_execution_time       Time taken to load data from the file
    pre-processing_phase_execution_time     Time taken to pre-process data
    simulation_phase_execution_time         Time taken to run the simulation
    post-processing_phase_execution_time    Time taken to complete the post-processing phase
    total_execution_time                    Total execution time
    peak_core_memory_in_use                 Peak memory required per core during the simulation
    total_memory_in_use Total               Peak memory in use
    ==============================================================================================================

The input and checkpoint file stores all quantities as three dimensional datasets with dimension sizes designed by `(Nx, Ny, Nz)`. In order to support scalars and 1D and 2D arrays, the unused dimensions are set to 1. For example, scalar variables are stored with a dimension size of `(1,1,1)`, 1D vectors oriented in y-direction are stored with a dimension size of `(1, Ny, 1)`, and so on. If the dataset stores a complex variable, the real and imaginary parts are stored in an interleaved layout and the lowest used dimension size is doubled (i.e., Nx for a 3D matrix, Ny for a 1D vector oriented in the y-direction). The datasets are physically stored in row-major order (in contrast to column-major order used by MATLAB) using either the ``H5T_IEEE_F32LE'` data type for floating point datasets or ``H5T_STD_U64LE'` for integer based datasets. All the datasets are store under the root group.

The output file of version 1.0 could only store recorded quantities as 3D datasets under the root group. However, with version 1.1 and the new cuboid corner sensor mask, the sampled quantities may be laid out as 4D quantities stored under specific groups. The dimensions are always `(Nx, Ny, Nz, Nt)`, every sampled cuboid is stored as a distinct dataset and the datasets are grouped under a group named by the quantity stored. This makes the file clearly readable and easy to parse.

In order to enable compression and more efficient data processing, big datasets are not stored as monolithic blocks but broken into chunks that may be compressed by the ZIP library and stored separately. The chunk size is defined as follows:

- `(1M elements, 1, 1)` in the case of 1D variables - index sensor mask (8MB blocks).
- `(Nx, Ny, 1)` in the case of 3D variables (one 2D slab).
- `(Nx, Ny, Nz, 1)` in the case of 4D variables (one time step).
- `(N_sensor_points, 1, 1)` in the case of the output time series (one time step of the simulation).

All datasets have two attributes that specify the content of the dataset. The ``data_type'` attribute specifies the data type of the dataset. The admissible values are either ``float'` or ``long'`. The ``domain_type'` attribute specifies the domain of the dataset. The admissible values are either ``real'` for the real domain or ``complex'` for the complex domain. The C++ code reads these attributes and checks their values.

    ==============================================================================================================
                                            Input File Datasets
    ==============================================================================================================
    Name                            Size           Data type       Domain Type      Condition of Presence
    ==============================================================================================================
      1. Simulation Flags
    --------------------------------------------------------------------------------------------------------------
      ux_source_flag                (1, 1, 1)       long           real
      uy_source_flag                (1, 1, 1)       long           real
      uz_source_flag                (1, 1, 1)       long           real
      p_source_flag                 (1, 1, 1)       long           real
      p0_source_flag                (1, 1, 1)       long           real
      transducer_source_flag        (1, 1, 1)       long           real
      nonuniform_grid_flag          (1, 1, 1)       long           real             must be set to 0
      nonlinear_flag                (1, 1, 1)       long           real
      absorbing_flag                (1, 1, 1)       long           real
    --------------------------------------------------------------------------------------------------------------
      2. Grid Properties
    --------------------------------------------------------------------------------------------------------------
      Nx                            (1, 1, 1)       long           real
      Ny                            (1, 1, 1)       long           real
      Nz                            (1, 1, 1)       long           real
      Nt                            (1, 1, 1)       long           real
      dt                            (1, 1, 1)       float          real
      dx                            (1, 1, 1)       float          real
      dy                            (1, 1, 1)       float          real
      dz                            (1, 1, 1)       float          real
      x_shift_neg_r                 (Nx/2+1, 1, 1)  float          complex          File version 1.1
      y_shift_neg_r                 (1, Ny/2+1, 1)  float          complex          File version 1.1
      z_shift_neg_r                 (1, 1, Nz/2+1)  float          complex          File version 1.1
    --------------------------------------------------------------------------------------------------------------
      3 Medium Properties
    --------------------------------------------------------------------------------------------------------------
      3.1 Regular Medium Properties
      rho0                          (Nx, Ny, Nz)    float          real             heterogenous
                                    (1, 1, 1)       float          real             homogenous
      rho0_sgx                      (Nx, Ny, Nz)    float          real             heterogenous
                                    (1, 1, 1)       float          real             homogenous
      rho0_sgy                      (Nx, Ny, Nz)    float          real             heterogenous
                                    (1, 1, 1)       float          real             homogenous
      rho0_sgz                      (Nx, Ny, Nz)    float          real             heterogenous
                                    (1, 1, 1)       float          real             homogenous
      c0                            (Nx, Ny, Nz)    float          real             heterogenous
                                    (1, 1, 1)       float          real             homogenous
      c_ref                         (1, 1, 1)       float          real

      3.2 Nonlinear Medium Properties (defined if (nonlinear_flag == 1))
      BonA                          (Nx, Ny, Nz)    float          real             heterogenous
                                    (1, 1, 1)       float          real             homogenous

      3.3 Absorbing Medium Properties (defined if (absorbing_flag == 1))
      alpha_coef                    (Nx, Ny, Nz)    float          real             heterogenous
                                    (1, 1, 1)       float          real             homogenous
      alpha_power                   (1, 1, 1)       float          real
    --------------------------------------------------------------------------------------------------------------
      4. Sensor Variables
    --------------------------------------------------------------------------------------------------------------
      sensor_mask_type              (1, 1, 1)       long           real             File version 1.1 (0 = index, 1 = corners)
      sensor_mask_index             (Nsens, 1, 1)   long           real             File version 1.0 always, File version 1.1 if sensor_mask_type == 0
      sensor_mask_corners           (Ncubes, 6, 1)  long           real             File version 1.1, if sensor_mask_type == 1
    --------------------------------------------------------------------------------------------------------------
      5 Source Properties
    --------------------------------------------------------------------------------------------------------------
      5.1 Velocity Source Terms (defined if (ux_source_flag == 1 || uy_source_flag == 1 || uz_source_flag == 1))
      u_source_mode                 (1, 1, 1)          long        real
      u_source_many                 (1, 1, 1)          long        real
      u_source_index                (Nsrc, 1, 1)       long        real
      ux_source_input               (1, Nt_src, 1)     float       real             u_source_many == 0
                                    (Nsrc, Nt_src, 1)  float       real             u_source_many == 1
      uy_source_input               (1, Nt_src,  1)    float       real             u_source_many == 0
                                    (Nsrc, Nt_src, 1)  float       real             u_source_many == 1
      uz_source_input               (1, Nt_src, 1)     float       real             u_source_many == 0
                                    (Nt_src, Nsrc, 1)  float       real             u_source_many == 1

      5.2 Pressure Source Terms (defined if p_source_flag == 1))
      p_source_mode                 (1, 1, 1)          long        real
      p_source_many                 (1, 1, 1)          long        real
      p_source_index                (Nsrc, 1, 1)       long        real
      p_source_input                (Nsrc, Nt_src, 1)  float       real             p_source_many == 1
                                    (1, Nt_src, 1)     float       real             p_source_many == 0

      5.3 Transducer Source Terms (defined if (transducer_source_flag == 1))
      u_source_index                (Nsrc, 1, 1)       long        real
      transducer_source_input       (Nt_src, 1, 1)     float       real
      delay_mask                    (Nsrc, 1, 1)       float       real

      5.4 IVP Source Terms (defined if ( p0_source_flag ==1))
      p0_source_input               (Nx, Ny, Nz)        float      real
    --------------------------------------------------------------------------------------------------------------
      6. K-space and Shift Variables
    --------------------------------------------------------------------------------------------------------------
      ddx_k_shift_pos_r             (Nx/2 + 1, 1, 1)  float        complex
      ddx_k_shift_neg_r             (Nx/2 + 1, 1, 1)  float        complex
      ddy_k_shift_pos               (1, Ny, 1)        float        complex
      ddy_k_shift_neg               (1, Ny, 1)        float        complex
      ddz_k_shift_pos               (1, 1, Nz)        float        complex
      ddz_k_shift_neg               (1, 1, Nz)        float        complex
    --------------------------------------------------------------------------------------------------------------
      7. PML Variables
    --------------------------------------------------------------------------------------------------------------
      pml_x_size                    (1, 1, 1)       long           real
      pml_y_size                    (1, 1, 1)       long           real
      pml_z_size                    (1, 1, 1)       long           real
      pml_x_alpha                   (1, 1, 1)       float          real
      pml_y_alpha                   (1, 1, 1)       float          real
      pml_z_alpha                   (1, 1, 1)       float          real

      pml_x                         (Nx, 1, 1)      float          real
      pml_x_sgx                     (Nx, 1, 1)      float          real
      pml_y                         (1, Ny, 1)      float          real
      pml_y_sgy                     (1, Ny, 1)      float          real
      pml_z                         (1, 1, Nz)      float          real
      pml_z_sgz                     (1, 1, Nz)      float          real
    ==============================================================================================================

    ==============================================================================================================
                                            Checkpoint File Datasets
    ==============================================================================================================
    Name                            Size           Data type       Domain Type      Condition of Presence
    ==============================================================================================================
      1. Grid Properties
    --------------------------------------------------------------------------------------------------------------
      Nx                            (1, 1, 1)       long           real
      Ny                            (1, 1, 1)       long           real
      Nz                            (1, 1, 1)       long           real
      Nt                            (1, 1, 1)       long           real
      t_index                       (1, 1, 1)       long           real
    --------------------------------------------------------------------------------------------------------------
      2. Simulation state
    --------------------------------------------------------------------------------------------------------------
      p                            (Nx, Ny, Nz)    float           real
      ux_sgx                       (Nx, Ny, Nz)    float           real
      uy_sgy                       (Nx, Ny, Nz)    float           real
      uz_sgz                       (Nx, Ny, Nz)    float           real
      rhox                         (Nx, Ny, Nz)    float           real
      rhoy                         (Nx, Ny, Nz)    float           real
      rhoz                         (Nx, Ny, Nz)    float           real
    --------------------------------------------------------------------------------------------------------------

    ==============================================================================================================
                                            Output File Datasets
    ==============================================================================================================
    Name                            Size           Data type       Domain Type      Condition of Presence
    ==============================================================================================================
      1. Simulation Flags
    --------------------------------------------------------------------------------------------------------------
      ux_source_flag                (1, 1, 1)       long           real
      uy_source_flag                (1, 1, 1)       long           real
      uz_source_flag                (1, 1, 1)       long           real
      p_source_flag                 (1, 1, 1)       long           real
      p0_source_flag                (1, 1, 1)       long           real
      transducer_source_flag        (1, 1, 1)       long           real
      nonuniform_grid_flag          (1, 1, 1)       long           real
      nonlinear_flag                (1, 1, 1)       long           real
      absorbing_flag                (1, 1, 1)       long           real
      u_source_mode                 (1, 1, 1)       long           real             if u_source
      u_source_many                 (1, 1, 1)       long           real             if u_source
      p_source_mode                 (1, 1, 1)       long           real             if p_source
      p_source_many                 (1, 1, 1)       long           real             if p_source
    --------------------------------------------------------------------------------------------------------------
      2. Grid Properties
    --------------------------------------------------------------------------------------------------------------
      Nx                            (1, 1, 1)       long           real
      Ny                            (1, 1, 1)       long           real
      Nz                            (1, 1, 1)       long           real
      Nt                            (1, 1, 1)       long           real
      dt                            (1, 1, 1)       float          real
      dx                            (1, 1, 1)       float          real
      dy                            (1, 1, 1)       float          real
      dz                            (1, 1, 1)       float          real
    -------------------------------------------------------------------------------------------------------------
      3. PML Variables
    --------------------------------------------------------------------------------------------------------------
      pml_x_size                    (1, 1, 1)       long           real
      pml_y_size                    (1, 1, 1)       long           real
      pml_z_size                    (1, 1, 1)       long           real
      pml_x_alpha                   (1, 1, 1)       float          real
      pml_y_alpha                   (1, 1, 1)       float          real
      pml_z_alpha                   (1, 1, 1)       float          real

      pml_x                         (Nx, 1, 1)      float          real
      pml_x_sgx                     (Nx, 1, 1)      float          real
      pml_y                         (1, Ny, 1)      float          real
      pml_y_sgy                     (1, Ny, 1)      float          real
      pml_z                         (1, 1, Nz)      float          real
      pml_z_sgz                     (1, 1, Nz)      float          real
    --------------------------------------------------------------------------------------------------------------
      4. Sensor Variables (present if --copy_sensor_mask)
    --------------------------------------------------------------------------------------------------------------
      sensor_mask_type              (1, 1, 1)       long           real             File version 1.1 and --copy_sensor_mask
      sensor_mask_index             (Nsens, 1, 1)   long           real             File version 1.1 and if sensor_mask_type == 0
      sensor_mask_corners           (Ncubes, 6, 1)  long           real             File version 1.1 and if sensor_mask_type == 1
    --------------------------------------------------------------------------------------------------------------
      5a. Simulation Results: if sensor_mask_type == 0 (index), or File version == 1.0
    --------------------------------------------------------------------------------------------------------------
      p                             (Nsens, Nt - s, 1) float       real             -p or --p_raw
      p_rms                         (Nsens, 1, 1)      float       real             --p_rms
      p_max                         (Nsens, 1, 1)      float       real             --p_max
      p_min                         (Nsens, 1, 1)      float       real             --p_min
      p_max_all                     (Nx, Ny, Nz)       float       real             --p_max_all
      p_min_all                     (Nx, Ny, Nz)       float       real             --p_min_all
      p_final                       (Nx, Ny, Nz)       float       real             --p_final

      ux                            (Nsens, Nt - s, 1) float       real             -u or --u_raw
      uy                            (Nsens, Nt - s, 1) float       real             -u or --u_raw
      uz                            (Nsens, Nt - s, 1) float       real             -u or --u_raw

      ux_non_staggered              (Nsens, Nt - s, 1) float       real             --u_non_staggered_raw (File version ==1.1)
      uy_non_staggered              (Nsens, Nt - s, 1) float       real             --u_non_staggered_raw (File version ==1.1)
      uz_non_staggered              (Nsens, Nt - s, 1) float       real             --u_non_staggered_raw (File version ==1.1)

      ux_rms                        (Nsens, 1, 1)      float       real             --u_rms
      uy_rms                        (Nsens, 1, 1)      float       real             --u_rms
      uz_rms                        (Nsens, 1, 1)      float       real             --u_rms

      ux_max                        (Nsens, 1, 1)      float       real             --u_max
      uy_max                        (Nsens, 1, 1)      float       real             --u_max
      uz_max                        (Nsens, 1, 1)      float       real             --u_max

      ux_min                        (Nsens, 1, 1)      float       real             --u_min
      uy_min                        (Nsens, 1, 1)      float       real             --u_min
      uz_min                        (Nsens, 1, 1)      float       real             --u_min

      ux_max_all                    (Nx, Ny, Nz)       float       real             --u_max_all
      uy_max_all                    (Nx, Ny, Nz)       float       real             --u_max_all
      uz_max_all                    (Nx, Ny, Nz)       float       real             --u_max_all

      ux_min_all                    (Nx, Ny, Nz)       float       real             --u_min_all
      uy_min_all                    (Nx, Ny, Nz)       float       real             --u_min_all
      uz_min_all                    (Nx, Ny, Nz)       float       real             --u_min_all

      ux_final                      (Nx, Ny, Nz)       float       real             --u_final
      uy_final                      (Nx, Ny, Nz)       float       real             --u_final
      uz_final                      (Nx, Ny, Nz)       float       real             --u_final
    --------------------------------------------------------------------------------------------------------------
      5b. Simulation Results: if sensor_mask_type == 1 (corners) and File version == 1.1
    --------------------------------------------------------------------------------------------------------------
      /p                            group of datasets, one per cuboid               -p or --p_raw
      /p/1                          (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid
      /p/2                          (Cx, Cy, Cz, Nt-s) float       real               2nd sampled cuboid, etc.

      /p_rms                        group of datasets, one per cuboid               --p_rms
      /p_rms/1                      (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid

      /p_max                        group of datasets, one per cuboid               --p_max
      /p_max/1                      (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid

      /p_min                        group of datasets, one per cuboid               --p_min
      /p_min/1                      (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid

      p_max_all                     (Nx, Ny, Nz)       float       real             --p_max_all
      p_min_all                     (Nx, Ny, Nz)       float       real             --p_min_all
      p_final                       (Nx, Ny, Nz)       float       real             --p_final

      /ux                           group of datasets, one per cuboid               -u or --u_raw
      /ux/1                         (Cx, Cy, Cz, Nt-s) float       real                1st sampled cuboid
      /uy                           group of datasets, one per cuboid               -u or --u_raw
      /uy/1                         (Cx, Cy, Cz, Nt-s) float       real                1st sampled cuboid
      /uz                           group of datasets, one per cuboid               -u or --u_raw
      /uz/1                         (Cx, Cy, Cz, Nt-s) float       real                1st sampled cuboid

      /ux_non_staggered             group of datasets, one per cuboid               --u_non_staggered_raw
      /ux_non_staggered/1           (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid
      /uy_non_staggered             group of datasets, one per cuboid               --u_non_staggered_raw
      /uy_non_staggered/1           (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid
      /uz_non_staggered             group of datasets, one per cuboid               --u_non_staggered_raw
      /uz_non_staggered/1           (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid

      /ux_rms                       group of datasets, one per cuboid               --u_rms
      /ux_rms/1                     (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid
      /uy_rms                       group of datasets, one per cuboid               --u_rms
      /uy_rms/1                     (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid
      /uz_rms                       group of datasets, one per cuboid               --u_rms
      /uy_rms/1                     (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid

      /ux_max                       group of datasets, one per cuboid               --u_max
      /ux_max/1                     (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid
      /uy_max                       group of datasets, one per cuboid               --u_max
      /ux_max/1                     (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid
      /uz_max                       group of datasets, one per cuboid               --u_max
      /ux_max/1                     (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid

      /ux_min                       group of datasets, one per cuboid               --u_min
      /ux_min/1                     (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid
      /uy_min                       group of datasets, one per cuboid               --u_min
      /ux_min/1                     (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid
      /uz_min                       group of datasets, one per cuboid               --u_min
      /ux_min/1                     (Cx, Cy, Cz, Nt-s) float       real               1st sampled cuboid

      ux_max_all                    (Nx, Ny, Nz)       float       real             --u_max_all
      uy_max_all                    (Nx, Ny, Nz)       float       real             --u_max_all
      uz_max_all                    (Nx, Ny, Nz)       float       real             --u_max_all

      ux_min_all                    (Nx, Ny, Nz)       float       real             --u_min_all
      uy_min_all                    (Nx, Ny, Nz)       float       real             --u_min_all
      uz_min_all                    (Nx, Ny, Nz)       float       real             --u_min_all

      ux_final                      (Nx, Ny, Nz)       float       real             --u_final
      uy_final                      (Nx, Ny, Nz)       float       real             --u_final
      uz_final                      (Nx, Ny, Nz)       float       real             --u_final
    ==============================================================================================================

# License

This file is part of the C++ extension of the k-Wave Toolbox (http://www.k-wave.org).
Copyright (C) 2014 Jiri Jaros and Bradley Treeby

This file is part of k-Wave. k-Wave is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

k-Wave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with k-Wave. If not, see http://www.gnu.org/licenses/.

Definition in file HDF5_File.h.