Definition: |
atom x2 = arccos(atom x1)
|
Description: | Return an angle with cosine equal to x1. |
Comments: | The argument, x1, must be in the range -1 to +1 inclusive.
A value between 0 and PI radians will be returned. This function may be applied to an atom or sq_arccos() to all elements of a sequence. The rules for sequence operations apply. arccos() is not as fast as arctan(). |
Example: |
s = arccos(-1) -- s is 3.141592654 |
See Also: | cos, arcsin, arctan |