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asin(+Number, -Result)

Evaluates the trigonometric function asin(Number) and unifies the resulting value with Result.
Number
A number.
Result
Output: float.

Description

This predicate is used by the ECLiPSe compiler to expand evaluable arithmetic expressions. So the call to asin(Number, Result) is equivalent to 
    Result is asin(Number)
which should be preferred for portability.

In coroutining mode, if Number is uninstantiated, the call to asin/2 is delayed until this variable is instantiated.

Modes and Determinism

Exceptions

(4) instantiation fault
Number is not instantiated (non-coroutining mode only).
(24) number expected
Number is not of a numeric type.
(20) arithmetic exception
Illegal arithmetic operation: Number is greater than 1 or less than -1.
(141) unimplemented functionality
Argument is of type breal

Examples

Success:
    Result is asin(1.0).		% gives Result = 1.5708
    Result is asin(-0,5).		% gives Result = -0.523599

Error:
    Result is asin(2.0).		% arithmetic exception

See Also

is / 2