[ Arithmetic | Reference Manual | Alphabetic Index ]
Evaluates the trigonometric function cos(Number) and unifies the resulting
value with Result.
- A number.
- Output: float or breal.
This predicate is used by the ECLiPSe compiler to expand evaluable
arithmetic expressions. So the call to cos(Number, Result) is
Result is cos(Number)
which should be preferred for portability.
In coroutining mode, if Number is uninstantiated, the call to cos/2 is
delayed until this variable is instantiated.
Modes and Determinism
- (4) instantiation fault
- Number is not instantiated (non-coroutining mode only).
- (24) number expected
- Number is not of a numeric type.
Result is cos(0). % gives Result = 1.0
Result is cos(1.2). % gives Result = 0.362358
Result is cos(-33). % gives Result = -0.0132767
is / 2