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man pages->NetBSD man pages -> erf (3)
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## ERF(3)

```
```

### NAME[Toc][Back]

```     erf, erff, erfc, erfcf - error function operators
```

### LIBRARY[Toc][Back]

```     Math Library (libm, -lm)
```

### SYNOPSIS[Toc][Back]

```     #include <math.h>

double
erf(double x);

float
erff(float x);

double
erfc(double x);

float
erfcf(float x);
```

### DESCRIPTION[Toc][Back]

```     These functions calculate the error function of x.

The erf() calculates the error function of x; where

erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.

The erfc() function calculates the complementary error function of x;
that is erfc() subtracts the result of the error function erf(x) from
1.0.  This is useful, since for large x places disappear.
```

```     math(3)
```

### HISTORY[Toc][Back]

```     The erf() and erfc() functions appeared in 4.3BSD.

BSD                             April 20, 1991                             BSD
```
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