You should provide reproducible code and at the very least declare the packages you are using. I guess this from the package raster? See example in ?raster::interpolate:
## Thin plate spline interpolation with x and y only library(fields) r <- raster(system.file("external/test.grd", package="raster")) ra <- aggregate(r, 10) xy <- data.frame(xyFromCell(ra, 1:ncell(ra))) v <- getValues(ra) tps <- Tps(xy, v) p <- raster(r) p <- interpolate(p, tps) One way to convert this to tabular format is to coerce to SpatialGridDataFrame, then write that out with write.table (write.csv): require(sp) head(as.data.frame(as(p, "SpatialGridDataFrame"))) layer s1 s2 1 1823.450 178420 333980 2 1818.925 178460 333980 3 1814.405 178500 333980 4 1809.876 178540 333980 5 1805.324 178580 333980 6 1800.734 178620 333980 There would be functions in raster to do that more directly, I'm just not that familiar with it. So, x <- as.data.frame(as(p, "SpatialGridDataFrame")) Now x is just a data.frame with every cell stored explicitly with its centre coordinate, "s1" and "s2" are the X and Y coordinates, "layer" is the raster value. Cheers, Mike. On Fri, May 11, 2012 at 1:12 AM, Mintewab Bezabih <mintewab.beza...@economics.gu.se> wrote: > > Dear R users, > > I was wondering how I can convert a raster image (that made R through > interpolation) into an ascii or csv format? > > this is the last line of my command > > p <- interpolate(r, tpsfit) > > So p is my raster file which I want to convert into ascii or csv > > Many thanks > Regards > Mintewab > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Michael Sumner Institute for Marine and Antarctic Studies, University of Tasmania Hobart, Australia e-mail: mdsum...@gmail.com ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.