COS Function
Calculates the cosine of the input variable.
enabled.Usage
result = COS(x)
Input Parameters
x—The angle for which the cosine is desired, specified in radians.
Returned Value
result—The trigonometric cosine of x.
Keywords
None.
Discussion
If x is a double-precision floating-point or complex data type, the result is of the same type. All others yield a single-precision floating-point result.
COS handles complex numbers in the following manner:
cos(x) = complex(cos(i)cosh(r), –sin(r)sinh(–i))
where r and i are the real and imaginary parts of x. If x is an array, the result of COS has the same dimensions (size and shape) as x, with each element containing the cosine of the corresponding element of x.
Example
x = [-60, -30, 0, 30, 60]
PRINT, COS(x * !Dtor)
; PV-WAVE prints: 0.500000 0.866025 1.00000 0.866025 0.500000
See Also
For a list of other transcendental functions, see "Transcendental Mathematical Functions" on page 75.
