---
name: "PDL::GSLSF::TRIG"
section: "3pm"
platform: "linux"
package: "pdl"
version: "1:2.081-2"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/PDL::GSLSF::TRIG"
---

# PDL::GSLSF::TRIG(3pm)

PDL interface to GSL Special Functions

## NAME

PDL::GSLSF::TRIG - PDL interface to GSL Special Functions

## DESCRIPTION

This is an interface to the Special Function package present in the GNU Scientific Library.

## FUNCTIONS

### gsl\_sf\_sin

```
  Signature: (double x(); double [o]y(); double [o]e())
```

Sin(x) with GSL semantics.

gsl\_sf\_sin does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_cos

```
  Signature: (double x(); double [o]y(); double [o]e())
```

Cos(x) with GSL semantics.

gsl\_sf\_cos does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_hypot

```
  Signature: (double x(); double xx(); double [o]y(); double [o]e())
```

Hypot(x,xx) with GSL semantics.

gsl\_sf\_hypot does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_complex\_sin

```
  Signature: (double zr(); double zi(); double [o]x(); double [o]y(); double [o]xe(); double [o]ye())
```

Sin(z) for complex z

gsl\_sf\_complex\_sin does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_complex\_cos

```
  Signature: (double zr(); double zi(); double [o]x(); double [o]y(); double [o]xe(); double [o]ye())
```

Cos(z) for complex z

gsl\_sf\_complex\_cos does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_complex\_logsin

```
  Signature: (double zr(); double zi(); double [o]x(); double [o]y(); double [o]xe(); double [o]ye())
```

Log(Sin(z)) for complex z

gsl\_sf\_complex\_logsin does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_lnsinh

```
  Signature: (double x(); double [o]y(); double [o]e())
```

Log(Sinh(x)) with GSL semantics.

gsl\_sf\_lnsinh does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_lncosh

```
  Signature: (double x(); double [o]y(); double [o]e())
```

Log(Cos(x)) with GSL semantics.

gsl\_sf\_lncosh does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_polar\_to\_rect

```
  Signature: (double r(); double t(); double [o]x(); double [o]y(); double [o]xe(); double [o]ye())
```

Convert polar to rectlinear coordinates.

gsl\_sf\_polar\_to\_rect does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_rect\_to\_polar

```
  Signature: (double x(); double y(); double [o]r(); double [o]t(); double [o]re(); double [o]te())
```

Convert rectlinear to polar coordinates. return argument in range \[-pi, pi\].

gsl\_sf\_rect\_to\_polar does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_angle\_restrict\_symm

```
  Signature: (double [o]y())
```

Force an angle to lie in the range (-pi,pi\].

gsl\_sf\_angle\_restrict\_symm does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_angle\_restrict\_pos

```
  Signature: (double [o]y())
```

Force an angle to lie in the range \[0,2 pi).

gsl\_sf\_angle\_restrict\_pos does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_sin\_err

```
  Signature: (double x(); double dx(); double [o]y(); double [o]e())
```

Sin(x) for quantity with an associated error.

gsl\_sf\_sin\_err does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

### gsl\_sf\_cos\_err

```
  Signature: (double x(); double dx(); double [o]y(); double [o]e())
```

Cos(x) for quantity with an associated error.

gsl\_sf\_cos\_err does not process bad values. It will set the bad-value flag of all output ndarrays if the flag is set for any of the input ndarrays.

## AUTHOR

This file copyright (C) 1999 Christian Pellegrin \<chri@infis.univ.trieste.it\> All rights reserved. There is no warranty. You are allowed to redistribute this software / documentation under certain conditions. For details, see the file COPYING in the PDL distribution. If this file is separated from the PDL distribution, the copyright notice should be included in the file.

The GSL SF modules were written by G. Jungman.