[R] multiframe in postscript

[Chong Gu]

I was hoping that the following specification

    postscript(file="fig.ps",height=2,width=4)
    par(mar=c(5,5,2,2)+.1,mfrow=c(1,2),mex=.6)

would yield the same scaling effect as

    postscript(file="fig.ps",height=2,width=6)
    par(mar=c(5,5,2,2)+.1,mfrow=c(1,3),mex=.6)

but the fact is that the 'mfrow=c(1,2)' yields smaller plotting frame
and bigger font size.  Some experiments show that the device scales
differently for two or less rows (columns) and three or more rows
(columns).

Is this a feature or "bug"?

I am running R-1.2, but I doubt the version matters here.

Chong
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