Help for asec

asec
Inverse secant.
y=asec(x)

Inputs
`x`	An array of real or complex numbers.
Outputs
`y`	An array of same size as `x` . Each element of the output is the inverse secant of the corresponding element of the input.

Example

>>x=randn(3,2);
>>x
    1.1155   -0.2629
   -2.8590   -0.6518
    1.9134    0.0791

>>z=sec(x);
>>y=asec(z);
>>y
    1.1155    0.2629
    2.8590    0.6518
    1.9134    0.0791

>>a=complexRandn(2,3)
>>a
    0.5875 +  0.8760i      -0.1992 -  0.6151i      -0.1578 +  0.0221i   
   -0.6179 -  0.3506i       0.0569 +  0.7888i       0.2012 +  0.0534i   

>>b=sec(a);
>>c=asec(b);
>>c
    0.5875 +  0.8760i       0.1992 +  0.6151i       0.1578 -  0.0221i   
    0.6179 +  0.3506i       0.0569 +  0.7888i       0.2012 +  0.0534i