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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
 Report an issue << nnz Sparse Matrix Manipulation spones >>

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