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In the process of moving a number of my scripts from MATLAB -> R, I've discovered that there is no 'pure' equivalent of MATLAB's cell arrays, which I use quite often. Basically, I create matrices (as a cell array) where each element of the matrix is itself a matrix (e.g., 2x2 cell array where each element of the array is another matrix). I pass these cell arrays to various

I want to do a series of contour plots, 4 in all. The data is coming from a data frame named "nd.frame", which has elements "xdf", "ydf", "zdf", and "pndt". I am treating "pndt" as a factor, and it has four levels. I make a call to the lattice graphics routine "contourplot" like so:

Hi, layout(1:2) # split the screen into 2 regions plot(1:2) # plot in region 1 plot(1:2) # plot in region 2 par(mfg=c(1,1)) # Then I want to update the plot in region 1 plot(1.5,1.5) But the this last plot overlays with my 1st plot. Q: How do I replace my first plot with my last? #### NOTE ###### I know I can do this with split.screen and screen(n,TRUE) But then it actually clears the