Name
cosm — matrix cosine function
Calling Sequence
t=cosm(x)
Parameters
- x
real or complex square matrix
Description
cosm(x) is the matrix cosine of the x matrix.
t=0.5*(expm(%i*x)+expm(-%i*x)).
Examples
A=[1,2;3,4]
cosm(A)-0.5*(expm(%i*A)+expm(-%i*A))