speye

Sparse identity matrix.

Syntax

• S = speye()
• S = speye(n)
• S = speye(n, m)
• S = speye(sz)

Input argument

• n, m - dimension sizes: nonnegative integer scalar.
• sz - dimension sizes: two-element row vector.

Output argument

• S - a sparse matrix.

Description

S = speye() returns a sparse scalar 1.

S = speye(n) returns a sparse n-by-n identity matrix, with ones on the main diagonal.

S = speye(n, m) returns a sparse n-by-m matrix, with ones on the main diagonal.

S = speye(sz) returns a matrix with ones on the main diagonal.

Example

tic();S = speye(5000, 5000);toc()
tic();S = sparse(eye(5000, 5000));toc()

See also

sparse.

History

Author

Allan CORNET