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Scilab Help >> Elementary Functions > Trigonometry > acoshm

# acoshm

matrix hyperbolic inverse cosine

### Calling Sequence

`t = acoshm(x)`

### Arguments

x, t

a real or complex square matrix.

### Description

`acoshm` is the matrix hyperbolic inverse cosine of the matrix `x`. Uses the formula `t=logm(x+(x+eye())*sqrtm((x-eye())/(x+eye())))`. For non-symmetric matrices result may be inaccurate.

### Examples

```A=[1,2;3,4];
coshm(acoshm(A))
A(1,1)=A(1,1)+%i;
coshm(acoshm(A))```

### See Also

• acosh — hyperbolic cosine inverse
• logm — square matrix logarithm
• sqrtm — matrix square root
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