This function uniquely determines the angle (-180,180] in degree or（-pi, pi] in radian from sine and cosine values.
S: sin value of the angle
C: cos value of the angle
out_mode: 'deg' OR 'rad'
the default output mode is in degree
theta = -120;
theta= 2.0944 [rad]
There are already vectorized built-in functions for this, atan2 and atan2d. Your submission is not vectorized and is not as capable as the built-in functions. I would suggest removing your submission from the FEX.
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