cosm¶

matrix cosine function

Calling Sequence¶

t=cosm(x)

:x real or complex square matrix :

cosm(x) is the matrix cosine of the x matrix. t=0.5*(expm(%i*x)+expm(-%i*x)).

A=[1,2;3,4]
cosm(A)-0.5*(`expm`_(%i*A)+`expm`_(-%i*A))