of the) system matrix from the same class object. This is demonstrated in the System matrix (OSEM) example between SA-WLS and ATP-WLS.</span></div><h3  class = 'S6' id = 'H_2F9ED031' ><span>Function based examples</span></h3><div  class = 'S1'><span>This is the very last example script in </span><a href = "https://github.com/villekf/OMEGA/blob/master/forward_backward_projections_example.m#L1137"><span>forward_backward_projections_example.m</span></a><span>. It is no longer recommended to compute the forward