Any C++/C equivalent function with sparse in MATLAB -

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i tried port m code c or cpp.

in code there line

a = sparse(i,j,ia,nr,nc);

which converts row index i, col index j, , data ia sparse matrix a size nr x nc.

is there equivalent code c++ or c?

an naïve algorithm duplicate result in full matrix is

double *a; = malloc(sizeof(double)*nr*nc); memset(a, 0, sizeof(double));  for(k=0; k<size_of_ia; k++)     a[i[k]*nc + j[k]] += ia[k];

note if there common indices, value not on overwritten, accumulated.

eigen example of c++ math matrix library cobtains sparse matrices. overloads operators make feel built in feature.

there many c , c++ matrix libraries. none ship part of std, nor there built in.

writing sparse matrix library quite hard; best bet finding pre-written one. recommendation questions off topic


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