Re: [R] Impact of cex changing as a function of mfrow

Duncan Murdoch Sun, 02 Sep 2012 11:45:32 -0700

On 12-09-02 1:40 PM, Dennis Fisher wrote:

R 2.15.1
OS X (MLion)


Colleagues,

I am aware that changes in mfrow / mfcol in par() affect cex (from help: In a layout with 
exactly two rows and columns the base value of ‘"cex"’ is reduced by a factor 
of 0.83: if there are three or more of either rows or columns, the reduction factor is 
0.66).

I generate a multipage PDF in which mfrow varies such that cex is impacted.  
This affect mtext in the outer margin.  Sample code is pasted at the bottom of 
this email.  The impact is most obvious if one examines the text at the bottom 
of each page as one moves page-to-page.

Does anyone have a suggestion for how to overcome this (other than using brute 
force).

I am not sure what's wrong with brute force here. You know the formulafor the reduction; just apply a corresponding increase first.


Duncan Murdoch


Dennis

Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-866-PLessThan (1-866-753-7784)
www.PLessThan.com

# In a layout with exactly two rows and columns the base value of ‘"cex"’ is 
reduced by a factor of 0.83: if
# there are three or more of either rows or columns, the reduction factor is 
0.66.

FINDCEX <- function()
        {
        CORRECT <- 1
        MFROW           <- par()$mfrow
        MFCOL           <- par()$mfcol
        TEST            <- all(MFROW == MFCOL)
        if (TEST && MFROW == c(2,2))                            CORRECT <- 1 / 
0.83
        if (TEST && (MFROW[1] >= 3 | MFROW[2] >= 3))      CORRECT <- 1 / 0.66
        if (!TEST)      cat("MFROW does not equal MFCOL\n")
        cat(MFROW, CORRECT, "\n")
        return(CORRECT)
        }
pdf("TestCEX.pdf", 8, 6)
par(mfrow=c(1,1), omi=c(1,1,1,1))
plot(1)
mtext(outer=T, side=1, line=0, cex=1, "line 0")
mtext(outer=T, side=1, line=FINDCEX(), cex=1, "line FINDCEX")
mtext(outer=T, side=3, line=0, cex=1, "line 0")
mtext(outer=T, side=3, line=1, cex=1, "line 1")
mtext(outer=T, side=2, line=0, cex=1, "line 0")
mtext(outer=T, side=2, line=FINDCEX(), cex=1, "line FINDCEX")
mtext(outer=T, side=4, line=0, cex=1, "line 0")
mtext(outer=T, side=4, line=1, cex=1, "line 1")


par(mfrow=c(1,2), omi=c(1,1,1,1))
plot(1)
mtext(outer=T, side=1, line=0, cex=1, "line 0")
mtext(outer=T, side=1, line=FINDCEX(), cex=1, "line FINDCEX")
mtext(outer=T, side=3, line=0, cex=1, "line 0")
mtext(outer=T, side=3, line=1, cex=1, "line 1")
mtext(outer=T, side=2, line=0, cex=1, "line 0")
mtext(outer=T, side=2, line=FINDCEX(), cex=1, "line FINDCEX")
mtext(outer=T, side=4, line=0, cex=1, "line 0")
mtext(outer=T, side=4, line=1, cex=1, "line 1")

par(mfrow=c(2,2), omi=c(1,1,1,1))
plot(1)
mtext(outer=T, side=1, line=0, cex=1, "line 0")
mtext(outer=T, side=1, line=FINDCEX(), cex=1, "line FINDCEX")
mtext(outer=T, side=3, line=0, cex=1, "line 0")
mtext(outer=T, side=3, line=1, cex=1, "line 1")
mtext(outer=T, side=2, line=0, cex=1, "line 0")
mtext(outer=T, side=2, line=FINDCEX(), cex=1, "line FINDCEX")
mtext(outer=T, side=4, line=0, cex=1, "line 0")
mtext(outer=T, side=4, line=1, cex=1, "line 1")

par(mfrow=c(3,3), omi=c(1,1,1,1))
plot(1)
mtext(outer=T, side=1, line=0, cex=1, "line 0")
mtext(outer=T, side=1, line=FINDCEX(), cex=1, "line FINDCEX")
mtext(outer=T, side=3, line=0, cex=1, "line 0")
mtext(outer=T, side=3, line=1, cex=1, "line 1")
mtext(outer=T, side=2, line=0, cex=1, "line 0")
mtext(outer=T, side=2, line=FINDCEX(), cex=1, "line FINDCEX")
mtext(outer=T, side=4, line=0, cex=1, "line 0")
mtext(outer=T, side=4, line=1, cex=1, "line 1")

graphics.off()
system("open TestCEX.pdf")

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and provide commented, minimal, self-contained, reproducible code.

Re: [R] Impact of cex changing as a function of mfrow

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