acosm

Arguments

x

a real or complex square matrix.

t

a real or complex square matrix.

Description

t are cosine inverse of the x matrix. Diagonalization method is used. For non-symmetric matrices result may be inaccurate. One has t=-%i*logm(x+%i*sqrtm(eye()-x*x)).

Examples

A=[1,2;3,4];
cosm(acosm(A))

See also

• acos — element wise cosine inverse (radians)
• sqrtm — matrix square root
• logm — square matrix logarithm