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Scilab Help >> Sparse Matrix > Sparse Matrix Manipulation > speye

speye

sparse identity matrix

Calling Sequence

Isp=speye(nrows,ncols)
Isp=speye(A)

Arguments

nrows

integer (number of rows)

ncols

integer (number os columns)

A

sparse matrix

sp

sparse identity matrix

Description

Isp=speye(nrows,ncols) returns a sparse identity matrix Isp with nrows rows, ncols columns. (Non square identity matrix have a maximal number of ones along the main diagonal).

Isp=speye(A) returns a sparse identity matrix with same dimensions as A. If [m,n]=size(A), speye(m,n) and speye(A) are equivalent. In particular speye(3) is not equivalent to speye(3,3).

Examples

eye(3,3)-full(speye(3,3))

See Also

  • sparse — sparse matrix definition
  • full — sparse to full matrix conversion
  • eye — identity matrix
  • spzeros — sparse zero matrix
  • spones — sparse matrix
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Last updated:
Thu Oct 02 13:46:51 CEST 2014