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double | gammln (double xx) |
| Returns the value ln[?(xx)] for xx > 0. More...
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double | gammp (double a, double x) |
| Returns the incomplete gamma function P(a, x). More...
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double | gammq (double a, double x) |
| Returns the incomplete gamma function Q(a, x) ? 1 ? P(a, x). More...
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void | gser (double *gamser, double a, double x, double *gln) |
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void | gcf (double *gammcf, double a, double x, double *gln) |
| Returns the incomplete gamma function Q(a, x) evaluated by its continued fraction representation as gammcf. Also returns ln?(a) as gln. More...
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double | erf (double x) |
| Returns the error function erf(x). More...
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Error function.
- Author
- Numerical recepies.
Definition in file erf.h.
void gcf |
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double * |
gammcf, |
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double |
a, |
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double |
x, |
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double * |
gln |
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) |
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Returns the incomplete gamma function Q(a, x) evaluated by its continued fraction representation as gammcf. Also returns ln?(a) as gln.
Definition at line 103 of file erf.cpp.
References EPS, VC::exp, FPMIN, gammln(), ITMAX, and nrerror().