[R] how to save a heatmap.2 in png /jpeg /tiff

[Fred]

Hey Jeff, sorry for the "it just doesn't work", but it's really what it
does... 
I can't find any file called heatmap.2.png on my computer after creating my
heatmap.2 (that I can see on Quartz) and typing:
> png("heatmap.2.png")
Maybe I should add, that I am working on mac with MAC OS X (v.10.8.1).!!

It is not a problem of having a picture editor open when I try to create
this file.

Any other idea ??
Thanks

Fred



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