exp(+Number, -Result)

Evaluates the exponential function exp(Number) ("e to the power of Number") and unifies the resulting value with Result.

Description

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

    Result is exp(Number)

which should be preferred for portability.

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

(4) instantiation fault: Number is not instantiated (non-coroutining mode only).
(24) number expected: Number is not of a numeric type.

    Result is exp(0.0).       % gives Result = 1.0
    Result is exp(-6).        % gives Result = 0.00247875