 system matrix itself, either 
% the entire system matrix or a subset. However, to form the system matrix, the 
% class object has to be created with implementation 1 (e.g. |options.implementation 
% = 1|). The matrix itself is obtained with |B = formMatrix(A, subset_number)|, 
% where |subset_number| can be omitted if the entire system matrix is required.
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