Rotation

0th

Percentile

Rotate a set of point by a certain angle

Rotate a set of XY coordinates by an angle (in radians)

Keywords
manip
Usage
Rotation(xy, angle)
Arguments
xy
A 2-columns matrix or data frame containing a set of X and Y coordinates.
angle
Numeric. A scalar giving the angle at which the points should be rotated. The angle is in radians.
Value

A 2-columns matrix of the same size as xy giving the rotated coordinates.

Aliases
  • Rotation
Examples
set.seed(1)
### Create a set of coordinates
coords<-cbind(runif(20),runif(20))

### Create a series of angles
rad<-seq(0,pi,l=20)

opar <- par(mfrow=c(5,4))
for(i in rad){
	coords.rot<-Rotation(coords,i)
	plot(coords.rot)
}
par(opar)

### Rotate the coordinates by an angle of 90 degrees
coords.90<-Rotation(coords,90*pi/180)
coords.90

plot(coords,xlim=range(rbind(coords.90,coords)[,1]),ylim=range(rbind(coords.90,coords)[,2]),asp=1)
points(coords.90,pch=19)
Documentation reproduced from package spdep, version 0.6-9, License: GPL (>= 2)

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