expm1

(PHP 4 >= 4.1.0, PHP 5)

expm1 --  Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero

Description

float expm1 ( float number )

警告

�o�Ө�ƬO����ʽ��C�o�Ө�ƪ�欰�B�W�١B�M����ƪ����L���b��PHP�o�椤�i��|�b�q�p�U���ܡC �ϥΦ��ݦۦ�Ӿ᭷�I�C

expm1() returns the equivalent to 'exp(number) - 1' computed in a way that is accurate even if the value of number is near zero, a case where 'exp (number) - 1' would be inaccurate due to subtraction of two numbers that are nearly equal.

注: ��Ƥ�A�Ω� Windows �x�C

See also log1p() and exp().