---
name: "QwtDoublePointData"
section: "3"
platform: "linux"
package: "libqwt-doc"
version: "4.2.0-6"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/QwtDoublePointData"
---

# QwtDoublePointData(3)

## NAME

QwtDoublePointData -

## SYNOPSIS

Inherits **QwtData**.

## Detailed Description

Data class containing a single QwtArray\<QwtDoublePoint\> object.

Definition at line 79 of file qwt\_data.h.

### Public Member Functions

**QwtDoublePointData** (const QwtArray\< **QwtDoublePoint** \> &)\
 **QwtDoublePointData** & **operator=** (const **QwtDoublePointData** &)\
 virtual **QwtData** \* **copy** () const\
 virtual size\_t **size** () const\
 virtual double **x** (size\_t i) const\
 virtual double **y** (size\_t i) const\

## Constructor & Destructor Documentation

### QwtDoublePointData::QwtDoublePointData (const QwtArray\< QwtDoublePoint \> &)

Constructor

**See also:**

**QwtCurve::setData** and **QwtPlot::setCurveData**.

Definition at line 61 of file qwt\_data.cpp.

Referenced by copy().

## Member Function Documentation

### QwtData \* QwtDoublePointData::copy () const` [virtual]`

Return a pointer to a copy (virtual copy constructor)

Implements **QwtData**.

Definition at line 92 of file qwt\_data.cpp.

References QwtDoublePointData().

### QwtDoublePointData & QwtDoublePointData::operator= (const QwtDoublePointData &)

Assignment.

Definition at line 67 of file qwt\_data.cpp.

References d\_data.

### size\_t QwtDoublePointData::size () const` [virtual]`

Return the size of the data set

Implements **QwtData**.

Definition at line 77 of file qwt\_data.cpp.

### double QwtDoublePointData::x (size\_t i) const` [virtual]`

Return the x value of data point i

**Parameters:**

*i* Index

**Returns:**

x X value of data point i

Implements **QwtData**.

Definition at line 82 of file qwt\_data.cpp.

### double QwtDoublePointData::y (size\_t i) const` [virtual]`

Return the y value of data point i

**Parameters:**

*i* Index

**Returns:**

y Y value of data point i

Implements **QwtData**.

Definition at line 87 of file qwt\_data.cpp.

## Author

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