X EXP(X) = ewhere e = 2.71818... is the base of natural logarithms.

Due to the risk of numerical overflow, we leave it undefined for X > 87, while for X < -87 it produces 0.

It is possible to write E^X instead of EXP(X), if you give the parameter E the value 2.71818.... However, EXP(X) should result in significantly faster computations.

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