R - image of a pixel matrix?

Question

How would you you make an image from a matrix in R?

Matrix values would correspond to pixel intensity on image (although I am just interested in 0,1 values white or black at the moment.), while column and row numbers correspond to vertical and horizontal location on the image.

By make an image I mean display it on the screen and save it as a jpg.

Answer 1

You can display it on the screen easiest using 'image':

m = matrix(runif(100),10,10)
par(mar=c(0, 0, 0, 0))
image(m, useRaster=TRUE, axes=FALSE)

You can also have a look at the raster package...