exp10

Base 10 exponential function. (Common antilogarithm.)

SYNOPSIS:

double x, y, exp10();
y = exp10(x);

DESCRIPTION:

Returns 10 raised to the x power.

Range reduction is accomplished by expressing the argument as 10**x = 2**n 10**f, with |f| < 0.5 log10(2).
The Pade' form:

    1 + 2x P(x**2)/(Q(x**2) - P(x**2))

is used to approximate 10**f.

ACCURACY:
                      Relative error:
arithmetic   domain     # trials      peak         rms
    IEEE     -307,+307    30000       2.2e-16     5.5e-17
Test result from an earlier version (2.1):
    DEC       -38,+38     70000       3.1e-17     7.0e-18

ERROR MESSAGES:
   message        condition      value returned
   underflow      x < -MAXL10        0.0
   overflow       x > MAXL10       MAXNUM

DEC arithmetic: MAXL10 = 38.230809449325611792.
IEEE arithmetic: MAXL10 = 308.2547155599167.

请注意 : 本帮助页面不适用于最新版本的Enterprise Architect. 最新的帮助文档在这里.

exp10