[R] limit digits in text()? --> use formatC()
Martin Maechler
maechler at stat.math.ethz.ch
Thu Jun 10 11:33:36 CEST 1999
>>>>> On Thu, 10 Jun 1999, Bill Simpson <wsimpson at gcal.ac.uk> said:
Bill> I am labelling the axes of a persp() plot manually using
Bill> text(). For one spot in the plot I use:
Bill> text(-.62,.37,max(dprime)) The problem is that the label is
Bill> printed as 1.6456330961. I would like 1.6.
Bill> I tried options(digits=2) and str(digits.d=2)--no effect. (I
Bill> don't like these methods anyway since I just want to modify how
Bill> the label in the plot is printed; I want to print all the digits
Bill> otherwise.)
Bill> How should I do it? Is the only way to first set
Bill> options(digits=2), then compute dprime, then do text(), then when
Bill> done reset options(digits=10)?
Bill> Thanks very much for any help.
And then Bill posted
Bill> Sorry, I found the answer:
Bill> text(-.62,.37,round(max(dprime), digits=1))
which can still be improved especially when you write functions to be
re-used with different numbers..
My answer is: Instead of round(.), use
formatC(... , digits = ..., width = ... )
It is flexible (via optional arguments),
it is *not* influenced by options()$digits
*AND* it does the right thing very often, without any extra arguments.
The width argument might be particularly useful both for plotting,
and for cat(.)ing results out of for/while/... loops
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