There is ?rasterImage which can take a matrix of hex values, or a 3D array of individual colour dimension values in RGB. It's pretty low-level, used to add to an existing plot. The ancient ?image function leverages this facility if you use "useRaster = TRUE".
The "raster" package (no relation), uses the rasterImage engine to efficiently plot high-level raster objects, and provides a wide range of tools for upgrading a matrix to raster objects. There is a floating naming clash with the "raster" class of grDevices and the RasterLayer and raster::raster() functions to be aware of. Confusing? Yes, but so is "2 dimensional matrix with RGB values". In R, such a matrix would be 3D - two for the spatial X/Y matrix part, and one for each of the R, G, B values. In R-context, it could be 2D by storing as a hex character string. Both objects are understood by ?rasterImage and there are facilities for conversion. "Plotting as a surface" is also ambiguous, but we can use ?persp for a perspective view analogous to ?image (including par-ameter-like transformations available for "overplotting"), or rgl::quads3d and friends for interactive use. Cheers, Mike. On Sat, 9 Jan 2016 at 02:09 Martin Batholdy via R-help <r-help@r-project.org> wrote: > Hi, > > I have a 2 dimensional matrix with RGB values and would like to plot it as > a two dimensional surface. > > I am aware of functions like image() that plot a matrix of values as a > grid of coloured rectangles. > But I can not directly feed in the specific color value for each of these > rectangles, as far as I understand. > > Is there an easy way to just take a matrix of color values and plot it in > R? > > Thank You! > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > -- Dr. Michael Sumner Software and Database Engineer Australian Antarctic Division 203 Channel Highway Kingston Tasmania 7050 Australia [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
