1erf(3M)                 Mathematical Library Functions                 erf(3M)
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NAME

6       erf, erff, erfl - error function
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SYNOPSIS

9       c99 [ flag... ] file... -lm [ library... ]
10       #include <math.h>
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12       double erf(double x);
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15       float erff(float x);
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18       long double erfl(long double x);
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DESCRIPTION

22       These functions compute the error function of their argument x, defined
23       as:
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25       2/sqrt(pi)*intregral from 0 to x of exp(-t*t) dt
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RETURN VALUES

28       Upon successful completion, these functions return  the  value  of  the
29       error function.
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32       If x is NaN, a NaN is returned.
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35       If x is ±0, ±0 is returned.
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38       If x is ±Inf, ±1 is returned.
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41       If x is subnormal, 2/sqrt(pi) * 2 is returned.
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ATTRIBUTES

44       See attributes(5) for descriptions of the following attributes:
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49       ┌─────────────────────────────┬─────────────────────────────┐
50       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
51       ├─────────────────────────────┼─────────────────────────────┤
52       │Interface Stability          │Standard                     │
53       ├─────────────────────────────┼─────────────────────────────┤
54       │MT-Level                     │MT-Safe                      │
55       └─────────────────────────────┴─────────────────────────────┘
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SEE ALSO

58       erfc(3M),      feclearexcept(3M),      fetestexcept(3M),     isnan(3M),
59       math.h(3HEAD), attributes(5), standards(5)
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63SunOS 5.11                        12 Jul 2006                          erf(3M)
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