expm

Computes the matrix exponential of a square matrix.

Syntax

• res = expm(x)

Input argument

• x - a numeric value: scalar or square matrix (double or single)

Output argument

• res - a numeric value: a square matrix

Description

expm(x) computes the matrix exponential of x.

The computation is performed by first block-diagonalizing x and then applying a Pade approximation on each block.

Example

A = eye(3, 3);
res = expm(A)
res = expm(A+i)

History

Author

Allan CORNET