expm1 Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero &reftitle.description; floatexpm1 floatarg &warn.experimental.func; expm1 returns the equivalent to 'exp(arg) - 1' computed in a way that is accurate even if the value of arg is near zero, a case where 'exp (arg) - 1' would be inaccurate due to subtraction of two numbers that are nearly equal. &reftitle.parameters; arg The argument to process &reftitle.returnvalues; 'e' to the power of arg minus one &reftitle.changelog; &Version; &Description; 5.3.0 This function is now available on all platforms &reftitle.seealso; log1p exp