k-Wave

1. daga_pankaj
   

   Member
   Joined: Dec '23
   Posts: 13

   I am trying to run the BMode linear transducer example (in octave) and run into the following error:

   Computing scan line 1 of 96
   Running k-Wave simulation...
     start time: 29-Jan-2024 19:47:05
     reference sound speed: 1600.5115m/s
     prepending transducer.input_signal with 17 leading zeros
     appending transducer.input_signal with 17 trailing zeros
     dt: 36.075ns, t_end: 57.1429us, time steps: 1585
     input grid size: 216 by 108 by 108 grid points (40 by 20 by 20mm)
     maximum supported frequency: 3.78MHz
     expanding computational grid...
   error: elevation_delay_times(0): subscripts must be either integers 1 to (2^63)-1 or logicals
   error: called from
       delay_mask at line 1000 column 45
       get.input_signal at line 578 column 28
       isequal at line 86 column 7
       kspaceFirstOrder_expandGridMatrices at line 190 column 12
       kspaceFirstOrder_inputChecking at line 1558 column 5
       kspaceFirstOrder3D at line 574 column 1
       example_us_bmode_linear_transducer at line 242 column 21

   Seems like an indexing issue. I can run most of the other examples in Octave, so this seems like some script error somewhere.

   Posted 3 months ago #

2. daga_pankaj
   

   Member
   Joined: Dec '23
   Posts: 13

   The error seems to be coming from this isequal function comparing whether the source is used as a sensor as well...

   if ~(strcmp(class(sensor), 'kWaveTransducer') && isequal(sensor, source))

   Also, if I remove this line in the example script:

   transducer.elevation_focus_distance = 19e-3; % focus distance in the elevation plane [m]

   Then it seems to not get this error. I am just getting started on this. Can someone explain what impact this might have on the simulation?

   Posted 3 months ago #

3. daga_pankaj
   

   Member
   Joined: Dec '23
   Posts: 13

   Ok, some more details.

   This seems to be octave related. I got my hands on a Matlab licence and the code works fine.

   Also, the code in Matlab is about 7x times faster than octave.

   Matlab version: 2021b
   Octave: 8.4.0

   System: Apple M2 Pro 32GB OS: Sonoma 14.3

   Posted 3 months ago #

4. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,640

   Thanks for reporting back. We haven’t played with Octave for a long time, so I’m not sure what the compatibility is like I’m afraid.

   Posted 1 month ago #

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