http://www.k-wave.org/forum/topic/complete-beginner-question Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 21:27:09 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/complete-beginner-question#post-9247 Tue, 17 Feb 2026 12:48:38 +0000 xf20228 9247@http://www.k-wave.org/forum/ <p>Hi, </p> <p>I am working through the Homogeneous Propagation Medium Example but get this error when I run the example .m file:</p> <p>Arrays have incompatible sizes for this operation.</p> <p>Error in kspaceFirstOrder2D (line 920)<br /> ux_sgx = dt .* rho0_sgx_inv .* real(ifft2( bsxfun(@times, ddx_k_shift_pos, kappa .* fft2(p)) )) / 2;<br /> ^<br /> Error in example_ivp_homogeneous_medium (line 67)<br /> sensor_data = kspaceFirstOrder2D(kgrid, medium, source, sensor);<br /> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br /> So far, I have installed MATLAB R2025a, installed k-wave from add-ons, opened the example_ivp_homogeneous_medium.m file in the MATLAB editor, and run the code.</p> <p>If someone could tell me what I am doing wrong, I would appreciate it. </p>