[R] the title is too long for a graph
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Jun 11 07:57:15 CEST 2008
On Tue, 10 Jun 2008, Barry Rowlingson wrote:
> Hua Li wrote:
>> Hi All,
>>
>> I have a problem of putting long titles on a graph:
>>
>> for example,
>>
>> x= seq(1:100)
>> y=seq(1:100)
>> plot(x,y,main="p=0.05:A-B=3,C-D=10,D-E=100,A-F=2,AFR-E=3,ACE-D=1,ADEF-M=0,AED-E=10,DE-F=3,AB-J=4,AC-J=10,ED-F=1,ED-B=4,AF-B=10,CD-S=10,AM-C=4")
>>
>> R seems not able to print the whole title. The title content might be
>> changing and thus I don't know how long it is beforehand. Is there a way to
>> measure the length and then put the title into different lines accordingly?
>>
>
> There's a strwidth() function that gives the width of a string on the
> current plot. Note you have to do the plot first so that R knows the
> coordinates of the plot, since strwidth returns the width in plot
> coordinates. So:
As of R 2.7.0, that is only the default. You can have it in inches, for
example.
> t="This is a very long title and I would like to split it somewhere, but if I
> split it in the wrong place bad things will happen"
>
> x=(1:10)*100
> y=1:10
> plot(x,y) # x axis is 1:1000
> strwidth(t)
>
> gives:
>
> [1] 2002.939
>
> but
> plot(y,x) # x axis is 1:10
> strwidth(t)
> [1] 20.02939
>
> Now, once you've done your plot you can get the width with:
>
> diff(par()$usr[1:2])
> [1] 9.72
>
> and then if strwidth if your title is bigger than that you'll need to split
> it into N chunks. Your splitting algorithm will have to be clever if you want
> to break a sentence at word spaces though!
>
> Hopefully this is enough to get you going.
>
> Barry
>
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--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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