spones - Replace nonzero sparse matrix elements with ones - MATLAB (original) (raw)

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Replace nonzero sparse matrix elements with ones

Description

R = spones(S) generates a matrix R with the same sparsity structure as S, but with 1's in the nonzero positions.

Examples

c = sum(spones(S)) is the number of nonzeros in each column.

r = sum(spones(S'))' is the number of nonzeros in each row.

sum(c) and sum(r) are equal, and are equal to nnz(S).

Extended Capabilities

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The spones function fully supports GPU arrays. To run the function on a GPU, specify the input data as a gpuArray (Parallel Computing Toolbox). For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).

Version History

Introduced before R2006a