http://www.k-wave.org/forum/topic/error-in-mode-linear-transducer-example Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 21:36:19 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/error-in-mode-linear-transducer-example#post-9060 Wed, 20 Mar 2024 20:36:43 +0000 Bradley Treeby 9060@http://www.k-wave.org/forum/ <p>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. </p> http://www.k-wave.org/forum/topic/error-in-mode-linear-transducer-example#post-9031 Wed, 31 Jan 2024 16:46:15 +0000 daga_pankaj 9031@http://www.k-wave.org/forum/ <p>Ok, some more details.</p> <p>This seems to be octave related. I got my hands on a Matlab licence and the code works fine.</p> <p>Also, the code in Matlab is about 7x times faster than octave.</p> <p>Matlab version: 2021b<br /> Octave: 8.4.0</p> <p>System: Apple M2 Pro 32GB OS: Sonoma 14.3 </p> http://www.k-wave.org/forum/topic/error-in-mode-linear-transducer-example#post-9029 Tue, 30 Jan 2024 19:23:27 +0000 daga_pankaj 9029@http://www.k-wave.org/forum/ <p>The error seems to be coming from this <code>isequal</code> function comparing whether the source is used as a sensor as well...</p> <p><code>if ~(strcmp(class(sensor), &#39;kWaveTransducer&#39;) &amp;&amp; isequal(sensor, source))</code></p> <p>Also, if I remove this line in the example script:</p> <p><code>transducer.elevation_focus_distance = 19e-3; % focus distance in the elevation plane [m]</code> </p> <p>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? </p> http://www.k-wave.org/forum/topic/error-in-mode-linear-transducer-example#post-9024 Mon, 29 Jan 2024 19:55:43 +0000 daga_pankaj 9024@http://www.k-wave.org/forum/ <p>I am trying to run the BMode linear transducer example (in octave) and run into the following error:</p> <pre><code>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</code></pre> <p>Seems like an indexing issue. I can run most of the other examples in Octave, so this seems like some script error somewhere. </p>