k-Wave User Forum » Topic: Data Ordering of 3D sensor output

k-Wave User Forum » Topic: Data Ordering of 3D sensor output http://www.k-wave.org/forum/topic/data-ordering-of-3d-sensor-output Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 00:22:41 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://www.k-wave.org/forum/search.php KHO on "Data Ordering of 3D sensor output" http://www.k-wave.org/forum/topic/data-ordering-of-3d-sensor-output#post-1039 Tue, 20 Nov 2012 11:12:28 +0000 KHO 1039@http://www.k-wave.org/forum/ Ah yes, that makes perfect sense. Thank you very much! Bradley Treeby on "Data Ordering of 3D sensor output" http://www.k-wave.org/forum/topic/data-ordering-of-3d-sensor-output#post-1018 Fri, 16 Nov 2012 23:30:56 +0000 Bradley Treeby 1018@http://www.k-wave.org/forum/ Hi KHO, The ordering follows the MATLAB column-wise linear indexing (i.e., the order the matrix elements are physically stored in memory and on disk). In 3D, this means the matrices are indexed first in the x-direction (dimension 1), then the y-direction (dimension 2), and then the z-direction (dimension 3). Thus for your example, (a plane x = a), the order would be grid(a, 1, 1), grid(a, 2, 1), etc. One way to visualise the matrix ordering is to use reshape: <pre><code>>> Nx = 4; Ny = 3; Nz = 2; >> reshape((1:Nx*Ny*Nz), Nx, Ny, Nz) ans(:,:,1) = 1 5 9 2 6 10 3 7 11 4 8 12 ans(:,:,2) = 13 17 21 14 18 22 15 19 23 16 20 24</code></pre> Hope that helps, Brad. KHO on "Data Ordering of 3D sensor output" http://www.k-wave.org/forum/topic/data-ordering-of-3d-sensor-output#post-1014 Fri, 16 Nov 2012 12:15:29 +0000 KHO 1014@http://www.k-wave.org/forum/ Hi all, I was wondering, in what order the recorded data is actually stored. For a sensor that is built up from a list of cartesian coordinates, this is pretty clear (the data is stored in the same order as the sensor locations are defined), but for a sensor that is defined as a binary mask there is multiple options for the order of the sensor data. For example, if the plane x = a serves as a sensor, will the sensor data be stored in order of increasing y and then increasing z (i.e. grid(a,1,1), grid(a,2,1), grid(a,3,1), ..., grid(a,1,2), grid(a,2,2), ...) or vice versa (i.e. grid(a,1,1), grid(a,1,2), ..., grid(a,2,1), grid(a,2,2), ...), or maybe a totally different order?