---
name: "QwtPowerTransform"
section: "3"
platform: "linux"
package: "libqwt-doc"
version: "6.1.4-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/QwtPowerTransform"
---

# QwtPowerTransform(3)

A transformation using pow()

## NAME

QwtPowerTransform - A transformation using pow()

## SYNOPSIS

`#include <qwt_transform.h>`

Inherits **QwtTransform**.

### Public Member Functions

**QwtPowerTransform** (double exponent)\
 virtual **~QwtPowerTransform** ()\
 Destructor.  virtual double **transform** (double value) const\
 virtual double **invTransform** (double value) const\
 virtual **QwtTransform** \* **copy** () const\

## Detailed Description

A transformation using pow()

**QwtPowerTransform** preserves the sign of a value. F.e. a transformation with a factor of 2 transforms a value of -3 to -9 and v.v. Thus **QwtPowerTransform** can be used for scales including negative values.

## Constructor & Destructor Documentation

### QwtPowerTransform::QwtPowerTransform (double exponent)

Constructor

**Parameters:**

*exponent* Exponent

## Member Function Documentation

### QwtTransform \* QwtPowerTransform::copy () const` [virtual]`

**Returns:**

Clone of the transformation

Implements **QwtTransform**.

### double QwtPowerTransform::invTransform (double value) const` [virtual]`

**Parameters:**

*value* Value to be transformed

**Returns:**

Inverse exponentiation preserving the sign

Implements **QwtTransform**.

### double QwtPowerTransform::transform (double value) const` [virtual]`

**Parameters:**

*value* Value to be transformed

**Returns:**

Exponentiation preserving the sign

Implements **QwtTransform**.

## Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.