atan
Inverse tangent.
y=atan(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 tangent of the corresponding element of the input.


Example
>>a=complexRandn(2,3)
>>t=tan(a)
>>at=atan(t)
>>a
       0.7052 -     0.8577i         -0.6319 -     0.1019i          0.2836 -     0.1197i   
       0.1455 +     1.2416i          0.3964 +     1.0324i          0.5449 +     0.0057i   

>>at
       0.7052 -     0.8577i         -0.6319 -     0.1019i          0.2836 -     0.1197i   
       0.1455 +     1.2416i          0.3964 +     1.0324i          0.5449 +     0.0057i   

>>norm(tan(a)-tan(at))
       4.1633e-016