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asin(+Number, -Result)

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


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


(4) instantiation fault
Number is not instantiated (non-coroutining mode only).
(5) type error
Result is a number but not a float
(24) number expected
Number is not of a numeric type.
(24) number expected
Result is neither a number nor a variable.
(20) arithmetic exception
Illegal arithmetic operation: Number is greater than 1 or less than -1.
(141) unimplemented functionality
Argument is of type breal


      asin(1.0, Result).           (gives Result = 1.5708)
      asin(-0,5, Result).          (gives Result = -0.523599)
      asin(1, 0.0).
      asin(A, 6.0).                  (Error 4).
      asin(1, 3).                    (Error 5).
      asin(2, Result).               (Error 20).
      asin(4 + 2, -0.279415).        (Error 24).
      asin(1, r).                    (Error 24).

See Also

is / 2