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  1. calledol

    spdiags

    Hi, I'm trying to create a 40000x40000 sparse matrix with 2 diagonals. This is my code: n = 200; s = n*n; for j=1:2 for i=1:(s-1) if mod(i,n) == 0 u(i,j) = 0; else u(i,j) = 1; end end end c = [-1;1]; Y = spdiags(u,c,s,s); When I...

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