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

speye

sparse identity matrix

Syntax

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

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(A) is equal to speye(m,n).

Hence, speye(3) is equal to speye(1,1), NOT 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
  • diag — diagonal including or extracting
  • toeplitz — Toeplitz matrix (chosen constant diagonal bands)
  • spzeros — sparse zero matrix
  • spones — sparse matrix
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Last updated:
Mon Feb 12 19:26:50 CET 2018