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75 lines
1.5 KiB
Matlab
75 lines
1.5 KiB
Matlab
function [Ap, Ai, Ax] = sparse2csr(A, is_one_based_in)
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%
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% [Ap, Ai, Ax] = sparse2csr(A, [is_one_based])
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%
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% convert matlab sparse matrix to
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% Compressed sparse row format
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%
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is_one_based = 0;
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if (nargin >= 2),
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is_one_based = is_one_based_in;
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end;
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is_zero_based = ~is_one_based;
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nrow = size(A,1);
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ncol = size(A,2);
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nnzA = nnz(A);
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Ap = zeros( 1,nrow+1);
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Ai = zeros( 1,nnzA);
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Ax = zeros( 1,nnzA);
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% -----------------
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% coordinate format
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% -----------------
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[ii,jj,aa] = find(A);
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% ---------------------------
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% sort to group rows together
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% ---------------------------
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[dummy, iperm] = sort( jj + (ii-1) * ncol);
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clear dummy;
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ii = ii(iperm);
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jj = jj(iperm);
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aa = aa(iperm);
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% -------------------------
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% compute non-zeros per row
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% -------------------------
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nz_per_row = sum( A ~= 0, 2);
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% -------------------------
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% setup Ap(:) pointer array
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% -------------------------
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Ap(1) = 1;
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Ap(2:(nrow+1)) = 1+cumsum( nz_per_row(1:nrow) );
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% ------------------------------------------
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% fill Ai(:) column indices and Ax(:) values
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% ------------------------------------------
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istart=1;
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for irow=1:nrow,
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if (nz_per_row(irow) >= 1),
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iend = istart + nz_per_row(irow)-1;
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is_same_row = all( ii(istart:iend) == irow );
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if (~is_same_row),
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error(sprintf('sparse2csr: irow=%g,istart=%g,iend=%g', ...
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irow, istart, iend ));
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end;
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Ai(istart:iend) = jj(istart:iend);
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Ax(istart:iend) = aa(istart:iend);
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istart = iend + 1;
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end;
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end;
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if (is_zero_based),
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Ap = Ap-1;
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Ai = Ai-1;
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end;
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