Compute the arctangent of a double-precision floating-point number.
Compute the angle in the plane (in radians) between the positive x-axis and the ray from (0,0) to the point (x,y).
Compute the arctangent of a single-precision floating-point number.
Compute the arctangent(in degrees) of a double-precision floating-point number.
Compute the arctangent of each element retrieved from an input strided array via a callback function.