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Amount of storage allocated for nonzero matrix elements


n = nzmax(S)


n = nzmax(S) returns the amount of storage allocated for nonzero elements in sparse matrix S. For sparse matrices, nzmax(S) >= 1.

  • If S is a full matrix, then nzmax(S) is equal to prod(size(S)).

Often, nnz(S) and nzmax(S) are the same. But if S is created by an operation which produces fill-in matrix elements, such as sparse matrix multiplication or sparse LU factorization, then more storage might be allocated than is actually required, and nzmax(S) reflects this. Alternatively, sparse(i,j,s,m,n,nzmax) or its simpler form, spalloc(m,n,nzmax), can set nzmax in anticipation of later fill-in.

See Also

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Introduced before R2006a

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