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