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Matrix with two diagonals: Difference between revisions
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% Parameters:
%
% N -- number of rows (columns);
% sparse -- should be true to create a sparse matrix,
% default false (dense matrix).
%
% Return:
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% A matrix where all elements A(i, j) are zero except
% elements on the diagonal or on the back-diagonal.
% The diagonal (and back-diagonal) elements are equal 1.
if nargin < 2
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