expm - square matrix exponential

Calling Sequence

expm(X)

Parameters

• X : square matrix with real or complex entries.

Description

X is a square matrix expm(X) is the matrix

expm(X) = I + X + X^2 /2 + ...

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

Examples

X=[1 2;3 4]
expm(X)
logm(expm(X))    
 

See Also

logm  bdiag  coff  log  exp