File: acoshm.man

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.TH acoshm 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
acoshm - matrix hyperbolic inverse cosine
.SH CALLING SEQUENCE
.nf
t=acoshm(x)
.fi
.SH PARAMETERS
.TP 10
x,t
: real or complex square matrix
.SH DESCRIPTION
acoshm is the matrix hyperbolic  inverse cosine  of the matrix x.
Uses the formula \fVt=logm(x+(x+eye())*sqrtm((x-eye())/(x+eye())))\fR
For non symmetric matrices result may be inaccurate.
.SH EXAMPLE
.nf
A=[1,2;3,4];
coshm(acoshm(A))
A(1,1)=A(1,1)+%i;
coshm(acoshm(A))
.fi
.SH SEE ALSO
acosh, logm, sqrtm