[R] Question about 'text' (add lm summary to a plot)
dmb at mrc-dunn.cam.ac.uk
Sat Jul 23 17:11:49 CEST 2005
On Fri, 22 Jul 2005, Marc Schwartz (via MN) wrote:
>So I played around with this a bit, going back to Dan's original
>requirements and using Thomas' do.call() approach with legend(). Gabor's
>approach using sapply() will also work here. I have the following:
># Note the leading spaces here for alignment in the table
># This could be automated with formatC() or sprintf()
>my.slope.1 <- " 3.22"
>my.slope.2 <- "0.13"
>my.inter.1 <- "-10.66"
>my.inter.2 <- "1.96"
>my.Rsqua <- " 0.97"
>L <- list("Intercept:",
> bquote(paste(R^2, ":")),
> bquote(.(my.inter.1) %+-% .(my.inter.2)),
> bquote(.(my.slope.1) %+-% .(my.slope.2)),
>par(family = "mono")
>legend("topleft", legend = do.call("expression", L), ncol = 2)
>Note however, that while using the mono font helps with vertical
>alignment of numbers, the +/- sign still comes out in the default font,
>which is bold[er] than the text.
>If one uses the default font, which is variable spaced, it is
>problematic to get the proper alignment for the numbers. I even tried
>using phantom(), but that didn't quite get it, since the spacing is
>variable, as opposed to LaTeX's mono numeric spacing with default fonts.
>Also, note that I am only using two columns, rather than three, since
>trying to place the ":" as a middle column results in spacing that is
>too wide, given that the text.width argument is a scalar and is set to
>the maximum width of the character vectors.
>Note also that even with mono spaced fonts, the exponent in R^2 is still
>horizontally smaller than the other characters. Thus, spacing on that
>line may also be affected depending upon what else one might attempt.
>Not sure where else to go from here.
Ahhhhhh... So lovely! Thank you all so much!
I made a couple of tweeks to improve the overall appearance, using
"x.intersp = 0.1" tightens up the overall appearance, and using
"pch=c('','','',':',':',':')" adds the (aligned!) colons.
Here is the beauty...
my.slope.1 <- " 3.22"
my.slope.2 <- "0.13"
my.inter.1 <- " -10.66"
my.inter.2 <- "1.96"
my.Rsqua <- " 0.97"
L <- list("Intercept",
bquote(.(my.inter.1) %+-% .(my.inter.2)),
bquote(.(my.slope.1) %+-% .(my.slope.2)),
par(family = "mono")
legend = do.call("expression", L),
ncol = 2,
x.intersp = 0.1,
title="Yay! Thank You!"
However (the final gripe ;) it seems 'inset=' dosn't work. Setting this to
anything (including the default) seems to surpress the legend without
error. But hey!
>On Fri, 2005-07-22 at 14:01 -0400, Gabor Grothendieck wrote:
>> You are right. One would have to use do.call as you did
>> or the sapply method of one of my previous posts:
>> a <- 7
>> L <- list(bquote(alpha==.(a)),bquote(alpha^2+1==.(a^2+1)))
>> legend("topleft",legend=sapply(L, as.expression))
>> On 7/22/05, Thomas Lumley <tlumley at u.washington.edu> wrote:
>> > On Fri, 22 Jul 2005, Gabor Grothendieck wrote:
>> > >
>> > > I think legend accepts a list argument directly so that could be
>> > > simplified to just:
>> > >
>> > > a<-7
>> > > plot(1)
>> > > L <- list(bquote(alpha==.(a)),bquote(alpha^2+1==.(a^2+1)))
>> > > legend("topleft",legend=L)
>> > Except that it wouldn't then work: the mathematical stuff comes out as
>> > text.
>> > > The same comment seems to apply to my prior suggestion about
>> > > as.expression(bquote(...)), namely that one can just write the
>> > > following as text also supports a list argument:
>> > And this doesn't work either: you end up with %+-% rather than the
>> > plus-or-minus symbol.
>> > The reason I gave the do.call() version is that I had tried these simpler
>> > versions and they didn't work.
>> > -thomas
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