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cos(+Number, -Result)

Evaluates the trigonometric function cos(Number) and unifies the resulting value with Result.
Number
A number.
Result
A variable, float or breal.

Description

This predicate is used by the ECLiPSe compiler to expand evaluable arithmetic expressions. So the call to cos(Number, Result) is equivalent to
    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

Exceptions

(4) instantiation fault
Number is not instantiated (non-coroutining mode only).
(5) type error
Result is a number but not a float or breal
(24) number expected
Number is not of a numeric type.
(24) number expected
Result is neither a number nor a variable.

Examples

Success:
      cos(0, 1.0).
      cos(1.2, Result).        (gives Result = 0.362358)
      cos(-33, Result).        (gives Result = -0.0132767)
Fail:
      cos(1, 0.0).
Error:
      cos(A, 6.0).                   (Error 4).
      cos(0, 1).                     (Error 5).
      cos(4 + 2, 0.96017).           (Error 24).
      cos(5, r).                     (Error 24).



See Also

is / 2