http://www.k-wave.org/forum/topic/kspacefirstorder2d-matrix-dimensions-must-agree Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 08:16:34 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/kspacefirstorder2d-matrix-dimensions-must-agree#post-7569 Sat, 06 Jun 2020 18:23:01 +0000 Bradley Treeby 7569@http://www.k-wave.org/forum/ <p>Hi jf,</p> <p>Thanks for the report. We'll make an effort to migrate the name of <code>smooth</code> to something that doesn't conflict with the curve fitting toolbox.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/kspacefirstorder2d-matrix-dimensions-must-agree#post-7535 Mon, 01 Jun 2020 09:46:34 +0000 alhareth 7535@http://www.k-wave.org/forum/ <p>Dear jf</p> <p>I am facing the same problem. How to set the path of the toolbox and solve the problem? </p> http://www.k-wave.org/forum/topic/kspacefirstorder2d-matrix-dimensions-must-agree#post-7487 Wed, 06 May 2020 13:43:31 +0000 jf 7487@http://www.k-wave.org/forum/ <p>As far I can tell there is also another reason for this error appearance: While setting the path of the toolbox, i moved it to the bottom of the list. This prevented the toolbox integrated 'smooth' function to overload the matlab version, I think this is the reason that this error did not occur more often. Since I do not know how this interacts with other scripts I stick with renaming the smooth function and keep the toolbox at the bottom of the path-list. </p> http://www.k-wave.org/forum/topic/kspacefirstorder2d-matrix-dimensions-must-agree#post-7486 Wed, 06 May 2020 12:51:11 +0000 jf 7486@http://www.k-wave.org/forum/ <p>I guess I found the reason for this error, in 'kspaceFirstOrder_inputChecking' line 1540:</p> <p>source.p0 = smooth(source.p0, true);</p> <p>outputs a vector even though the input is a matrix. I replaced this line with </p> <p>source.p0 = smoothdata(source.p0, true);</p> <p>which returns a matrix, and it seems to be working (at least the output seems similar to the one in the documentation for this example).</p> <p>EDIT: I just realized that k-wave has its own smoothing function implemented, but as far I can tell, matlab is prioritizing using its own version. I just renamed the smoothing function in the toolbox folder from 'smooth' to 'smooth_k' and changed the line to</p> <p>source.p0 = smooth_k(source.p0, true);</p> <p>which also seems to work I guess as intended.</p> <p>EDIT2: Since 'smooth_k' recalls itself recursively line 62</p> <p>mat_sm = smooth(varargin{2:end});</p> <p>has to be changed to the renamed function aswell:</p> <p>mat_sm = smooth_k(varargin{2:end}); </p> http://www.k-wave.org/forum/topic/kspacefirstorder2d-matrix-dimensions-must-agree#post-7485 Wed, 06 May 2020 12:15:39 +0000 jf 7485@http://www.k-wave.org/forum/ <p>Hi,<br /> I just installed the k-wave toolbox and tried to run the examples, but I always get the same error (Matlab 2018b):</p> <p>Matrix dimensions must agree.</p> <p>Error in kspaceFirstOrder2D (line 920)<br /> ux_sgx = dt .* rho0_sgx_inv .* real(ifft2( bsxfun(@times, ddx_k_shift_pos,<br /> kappa .* fft2(p)) )) / 2;</p> <p>Error in example_3_ivp_opposing_corners_sensor_mask (line 82)<br /> sensor_data = kspaceFirstOrder2D(kgrid, medium, source, sensor);</p> <p>The reason for the error is that in the function 'bsxfun(@times, ddx_k_shift_pos, kappa .* fft2(p))' the variable 'kappa' is of size NxN (128x128 in example_ivp_homogeneous_medium), while 'fft2(p)' is of the size (N^2)x1 (16384). </p>