Rotate raster R

Question

I want to to a raster object that has x coordinates (longitude) from 0 to 360, to standard coordinates between -180 and 180 degrees.

I have a matrix where the longitude range is (0,360) and the latitude range is (-90,90) and has a resolution of 0.75 so that its dimensions are

dim(x)
[1] 480 241

Then I try

r <- rotate(x)

And I get this error

Error in rotate(x) : object "phy" is not of class "phylo"

Please provide a reproducible example. I also don't understand how this operation is a rotation. It seems to be only a shift (transformation of coordinates). — Roland, Apr 28 '16 at 10:57
@Roland yes http://www.inside-r.org/packages/cran/raster/docs/rotate — user3910073, Apr 28 '16 at 11:16

score 2 · Accepted Answer · answered Apr 28 '16 at 11:30

Try raster::rotate(x). You happen to have loaded the ape package after you loaded the raster package; both packages contain rotate functions. (Another alternative would be to detach("package:ape") and try again.)

If you type find("rotate") R will tell you where it's finding the function; the first element of the vector is the one it chooses by default.

When you loaded ape you should have gotten the following message:

Attaching package: ‘ape’
The following objects are masked from ‘package:raster’:
    rotate, zoom

Rotate raster R

1 Answers1