atan2 (Matlab function) Four-quadrant inverse tangent

## Matlab/Scilab equivalent

Matlab | Scilab
    atan2(y, x)
    atan2(y, x)   % x, y complex
    // No equivalent
    atan(y, x)
    atan(real(y), real(x))
    atan(y, x)   //  x, y complex