http://www.k-wave.org/forum/topic/error-with-h5create-chunksize-must-be-specified Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 00:43:33 +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-with-h5create-chunksize-must-be-specified#post-4727 Mon, 22 Sep 2014 09:57:13 +0000 Bradley Treeby 4727@http://www.k-wave.org/forum/ <p>Hi Sebastian,</p> <p>Firstly, apologies for taking so long to reply. I tried to replicate your error by creating a grid of the same size, however, it seemed to run ok. Could you post your code or tell us a bit more about your simulation, for example, the size of the source and sensor masks?</p> <p>Regarding the forum posting, we have been forced to use a more and more aggressive spam checker to keep the spam levels down. Occasionally it gets things wrong, and marks existing users as inactive. This is what happened to you a couple of weeks - please accept my apologies! I check the list periodically and noticed the error and changed it back. If it happens again, please drop me an email and I'll try and fix it asap.</p> <p>Kind regards,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/error-with-h5create-chunksize-must-be-specified#post-4699 Wed, 03 Sep 2014 09:48:29 +0000 bastlwastl 4699@http://www.k-wave.org/forum/ <p>Hi,</p> <p>when I'm running K-Wave to prepare a h5-file for a larger c++ simulation, I get this error:</p> <pre><code>Running k-Wave simulation... start time: 01-Sep-2014 17:48:25 reference sound speed: 1496.7015m/s dt: 10.022ns, t_end: 50us, time steps: 4990 input grid size: 900 by 44 by 44 grid points (45 by 13.2 by 13.2mm) maximum supported frequency: 14.967MHz by 2.4945MHz by 2.4945MHz expanding computational grid... computational grid size: 920 by 64 by 64 grid points precomputation completed in 1.5876s saving input files to disk... Error using h5create&gt;validate_options (line 122) The &#39;ChunkSize&#39; option must be specified if any extents are to be extendible. Error in h5create (line 67) options = validate_options(p.Results); Error in writeMatrix (line 170) h5create(filename,[&#39;/&#39; matrix_name], [Nx, Ny, Nz], ... Error in kspaceFirstOrder_saveToDisk (line 295) writeMatrix(save_to_disk, eval(integer_variable_list{cast_index}), integer_variable_list{cast_index}); Error in kspaceFirstOrder3D (line 688) kspaceFirstOrder_saveToDisk; Error in KWaveMasterScript_150MeV (line 46) kspaceFirstOrder3D(kgrid, medium, source,sensor, input_args{:});</code></pre> <p>I tried to specify the chunk size in writeMatrix but even to smallest value of [1 1 1] resulted in an error, that this chunksize is to large. I manage to run simulations before, even with similar settings and on this machine, so this really came out of nowhere.<br /> What can i do?</p> <p>Another thing: i wasn't able to post anything in this forum for the last days. After i wrote another post, the form for writing a reply or a new topic didn't appear. Even from different browsers and pcs. Now my other post appeared with a day delay. So I hope these lines appears earlier ;) Anyone else encountered this problem?</p> <p>Cheers,<br /> Sebastian </p>