mended.</span></div><div  class = 'S1'><span>After the initial setup phase, there are two different ways to actually compute </span><span style=' font-style: italic;'>Ax</span><span> and </span><span style=' font-style: italic;'>A^Ty</span><span>. The first, recommended, method is by using a MATLAB/Octave class that is demonstrated in the initial examples in </span><a href = "https://github.com/villekf/OMEGA/blob/master/forward_backward_projections_example.m#L821"><span>forward_backward_projections_example.