http://www.k-wave.org/forum/topic/affine-transformations-unsupported-for-line-elements-v14 Support for the k-Wave MATLAB toolbox en-US Thu, 14 May 2026 23:25:43 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/affine-transformations-unsupported-for-line-elements-v14#post-8702 Tue, 07 Feb 2023 19:00:34 +0000 Santeri 8702@http://www.k-wave.org/forum/ <p>Affine transformations appear to not be implemented for line elements at the moment. This seems to be fixable by adding a few lines that apply the affine transformation to the start_point and end_point vectors within the getOffGridPoints function in kWaveArray.</p> <p>For example, in the 2D case we currently have:</p> <p> px = linspace(obj.elements{element_num}.start_point(1) + d(1)/2, obj.elements{element_num}.end_point(1) - d(1)/2, m_integration);<br /> py = linspace(obj.elements{element_num}.start_point(2) + d(2)/2, obj.elements{element_num}.end_point(2) - d(2)/2, m_integration);</p> <p>Which does not apply the affine transformation. If we replace these lines with the following:</p> <p> start_affine = obj.affine(obj.elements{element_num}.start_point);<br /> end_affine = obj.affine(obj.elements{element_num}.end_point);<br /> px = linspace(start_affine(1) + d(1)/2, end_affine(1) - d(1)/2, m_integration);<br /> py = linspace(start_affine(2) + d(2)/2, end_affine(2) - d(2)/2, m_integration);</p> <p>Then the transformation appears to work. </p>