span><span style=' font-family: monospace;'>A * x</span><span> to compute forward projection and </span><span style=' font-family: monospace;'>A' * y</span><span> to compute backprojection. Subsets can be set with </span><span style=' font-family: monospace;'>A.subset = subset_number</span><span>. Alternatively, you can use the class object in function: </span><span style=' font-family: monospace;'>forwardProject(A, f, subset_number)</span><span> and </span><span style=' font-family: monospace;'>backwardPro