rotation | R Documentation |
Rotate a set of XY coordinates by an angle (in radians)
rotation(xy, angle)
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. |
A 2-columns matrix of the same size as xy
giving the rotated
coordinates.
F. Guillaume Blanchet
### Create a set of coordinates
coords<-cbind(runif(20),runif(20))
### Create a series of angles
rad<-seq(0,pi,l=20)
for(i in rad){
coords.rot<-rotation(coords,i)
plot(coords.rot)
}
### 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)
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