similar to: Basic Question about Upgrading to Newer Version of R

I am working on dumping raster data from R into PNG files using rasterImage(). I am working with a test matrix from the rasterImage() example and using it to produce a PNG image with the following code: # From the example for rasterImage(). A 3 pixel by 5 pixel b/w checkerboard. testImage <- as.raster(0:1, nrow=3, ncol=5) testImage [,1] [,2] [,3] [,4] [,5] [1,]

I am working on dumping raster data from R into PNG files using rasterImage(). I am working with a test matrix from the rasterImage() example and using it to produce a PNG image with the following code: # From the example for rasterImage(). A 3 pixel by 5 pixel b/w checkerboard. testImage <- as.raster(0:1, nrow=3, ncol=5) testImage [,1] [,2] [,3] [,4] [,5] [1,]

Hello, I have been exploring the possibility to transition some code that currently uses image() to use the new rasterImage(). To date, I haven't been able to specify a color look-up strategy that works. For example... nx <- 100 ny <- 100 m <- matrix(data = rep(seq(0,1, length = nx), ny), ncol = nx, nrow = ny, byrow = TRUE) plot(1:nx, 1:ny, type = "n") my.color

Dear all, This may be specific to Mac, I haven't had a chance to test another platform. Consider this, plot(1,1,t="n") rasterImage(matrix(1),1,1,1,1) library(grid) grid.rect(gp=gpar(fill="grey")) The grid.rect covers the full device window as expected. However, when I resize the window ever so slightly (interactive device) the rectGrob is suddenly clipped to the previous

I was pointed to the Cairo package for plotting PNG images on a device. I've been playing around with it, but found that after I use the rasterImage function, I can't add anything any more to the device, eg : img <- readPNG(system.file("img", "Rlogo.png", package="png")) r = as.raster(img[,,1:3]) r[img[,,4] == 0] = "white" CairoWin()

Has anyone yet tried incorporating rasterImage into the base image() function? It seems to make a *huge* difference, with a very small number of added/changed lines of code. (Of course I have barely tested it at all.) Is there any reason this *shouldn't* go into the next release? > source("image.R") > z <- matrix(runif(1e6),nrow=1000) > image(z) >

Hello, Below is a function (test.map) that permits drawing the same map using three different devices. The "pdf" device doesn't clip polygons to the plot region as I see it does by both the native device (in my case "Quartz") and the "png" device. test.map("pdf") # produces "test-map.pdf" with no clipping test.map("png") #

Hi R-help list What is the threshold for the `useRaster` argument of graphics::image() to decide whether a grid is "regular" or not (i.e. the usage of useRaster=T is allowed or not). My `dev.capabilities("rasterImage")$rasterImage` is "yes". I could not find this information in the internet. I also could not find the source code of the graphics::image() function (I

Hi, I have a plot and I would like to overlay a PNG image over it. I'm using the rasterImage function to do this, but the problem I'm facing is working out the coordinates of the upper right corner of the final image in user coordinates. That is I can place the image so the lower left is located at the bottom of the y-axis and the left end of the x-axis. Since my image is say 100px x

Hello R-Help, I want to be able to read in a raster image, plot it with grid.raster or rasterImage and save the image with one pixel per a pixel element from my array. Saved preferably in a common image format. The real goal of my question is to eventually read in images with text on them, manipulate them with my controlled functions, save them without changing the image dimensions, and perform

I am trying to add a copyright disclaimer outside the plot borders of some images I have created. I can use mtext() to add the written portion, but I would like to have the Creative Commons license image (http://en.wikipedia.org/wiki/File:Cc.logo.circle.svg) before the text. I've found that I can plot a .png image inside the plot boundaries using rasterImage() but I can't figure out how to

This question attacked me as I was thinking about matrix value updates. I probably will never need to do this, but wanted to ask if there are efficient methods to perform the for-loop in the following sequence. %xymat<-matrix(rep(0,100) nr=10,nc=10) # empty matrix %x<-1:10 %y<-sample.int(10,10,rep=T) %for (j in 1:10) xymat[x[j],y[j]] <- some_function(x[j],y[j]) #to create either

Dear Community I am at my wits end and seek advice. My wish is to plot coordinates (x,y in WGS84_UMTS for the ones interested) of sampling points. This I can do by the standard spatstat prodcedure via owin. I then try to add an image, which is a map/satellite photo in the background. Firstly Problem: With the current code, I can not get the edges of the image to match the boarders of the plot

Dear all, I noticed in the latest R version (R.2.12.1) that the readPNG gives following warning when running the example code in the help file (or when using any other png for that matter) : 50: In rasterImage(img, 1.2, 1.27, 1.8, 1.73) : Per-pixel alpha not supported on this device No picture is shown, and code I used to be able to run, doesn't run any more. > sessionInfo() R version

Someone inquired on StackOverflow about apparently non-deterministic graphics behaviour in R. I noticed that they were using cex="*" and discovered some potentially weird behavior. On repeated runs of the same code I can get different PNGs. If I set the number of runs high enough, I seem to be able to get R to hang. If I do a single version plotting to an interactive graphics

Hello, I am trying to upgrade to 2.11 from 2.10 in the hopes of gaining TCL/TK capabilities (let's pretend for the moment that this should work). I've added "deb http://cran.stat.ucla.edu/bin/linux/ubuntu lucid/" to /etc/apt/sources.list as described in the guide and have run apt-get update apt-get install r-base r-base-dev Things seem to work. When I look at the installed

Hello! I have had some problems lately with use of R at home and school. At my home laptop (Ubuntu linux 64bit & R-2.12.0) R works just fine. But when I take my codes to school(Windows XP 32bit & R-2.10.1 I think) and run those there those codes probably won't work. Functions as combinations() didn't work and expand.grid() worked a bit differently. About expand.grid I just

the details section of ?image says: > If useRaster is not specified, raster images are used when the > getOption("preferRaster") is true, the grid is regular and either > dev.capabilities("raster") is "yes" or it is "non-missing" and there > are no missing values. but in my experience this is never the case and

I am experiencing unexpected behavior with the command cat under Window GUI builds of R version 2.12.0 (it does not seem to be an issue in Rterm). For example if I issue the command cat(70,"\r") I get back text that looks like Asian characters. If I highlight and copy that text, it is the text I would regularly expect, e.g. the number 70 and the prompt line. Highlighting the text

Hello all, has someone please a few hints about how to 1.st: draw an image (preferrably a jpg) and then 2nd: plot() on that image I am using a mac - and after searching and trying different ways (I have installed EBImage) I now would like to ask for help... Thanks! Johann