rotate {secr} | R Documentation

## Rotate Points

### Description

Rotate a set of points.

### Usage

    rotate (object, degrees, centrexy = NULL, ...)

### Arguments

`object` | object that may be coerced to a numeric matrix
`degrees` | clockwise angle of rotation in degrees
`centrexy` | vector with xy coordinates of rotation centre
`...` | other arguments (not used)

### Details

The first column of `object` holds the x coordinates of the points and the second holds the y coordinates. If `centrexy` is NULL then rotation is about (0,0).

A generic method, introduced for the class-specific method `rotate.traps`.

### Value

A matrix with the location of each point rotated about the centre.

### Author(s)

Murray Efford murray.efford@otago.ac.nz

### See Also

`shift`

### Examples

    temp <- matrix(runif (20) * 2 - 1, nc = 2)
    temp2 <- rotate(temp, 25)
    plot(temp, xlim=c(-1.5,1.5), ylim = c(-1.5,1.5), pch = 16)
    points (0,0, pch=2)
    points (temp2, pch = 1)
    arrows (temp[,1], temp[,2], temp2[,1], temp2[,2], length = 0.1)

[Package secr version 1.2.11 Index]