I am looking for a way to select (and specifically redraw) one plot on a graphics device that is subdivided with layout(...). I know that this yould be possible after par(mfcol=...) with par(mfg=...), and that it would also be possible after split.screen(...) with screen(n=...). However, I need something similar after layout(...), because some plots have to have fixed absolute widths and heights (via lcm(x)).
I (can) want to redraw only one of the plots shown.
Any help is apprechiated.
If I understand your question correctly, below might be an inelegant/tedious way of doing what you require.
Successive function calls that create a new plot such as plot(), plot.new(), etc., seem to cycle through the subplots created using layout(). This suggests that a way to choose one particular subplot of your layout would be to invoke plot.new() appropriate number of times before the correct subplot is chosen.
The code snippet below is based on the scatterplot-with-marginal-histograms example in help( layout ). It creates 3 subplots, but plots only in subplot #3:
x
Thank you for the answers. However, they so not seem to solve my problem. I should probably give a conceret (constructed!) example:
The heatmap-function uses layout for plotting. With "verbose=TRUE" it prints the layout parmeters. Now consider you have plotted the heatmap and want to add something to one of the panels (or even re-draw an entire panel, e,g, to add a legend in the corner between the dendrograms). This is the code producing the heatmap:
heatmap(cor(USJudgeRatings) ,verbose=TRUE)
now one could go and re-make the layout:
mat = matrix(c(0,2,3,1),ncol=2)
w = c(1,4)
h = c(1,4)
layout(mat,w,h)
and now my problem starts. How do I select the panel I want to change? How can I change it without deleting all the other panels?
Even it I take the first "active" panel after layout(), the folloring code does *not* add the text:
par("usr" = c(0,1,0,1),mar=c(0,0,0,0))
text(0.5,0.5,"add some Text here")
calling plot() or frame() or something erases the entire graphic.
Thanks, Luca.
The modification of a function will surely work, but is not always possible. Another scenario you may think of is following:
Given a graphic with several panels and one of them should be frequently re-drawn to show some animation. When all the panels have to be re-drawn each time, the whole graph might flicker a lot or the animation might be too slow (depending on the amount an complexity of the things shown). However, I hope my point is clear. It is again just an example.
The first idea to (actually) place things in normalized-device-coordinates does not work, because the positions will change relative to the rest of the plot when the window is resized. (same for any other coordinate system, as far as I can think of)
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