[R] Math expressions in pie chart labels?

[Uwe Ligges]

ronggui wrote:

>> Then please read ?plotmath and use it:
>>
>> labels = expression("" >= 0.66, "" == 0.33, "" <= -0.33, "" <= -0.66)
> 
> 
> 
>> pie(1:3,lab="")
>> text(locator(3),lab=expression("">=1,""=2,""<=3))
> 
> Error: attempt to use zero-length variable name
> 
>> text(locator(3),lab=expression(NULL>=1,NULL=2,NULL<=3))
> 
> 
> What 's the problem come from?

You are using
  ""=2
which is not syntactically correct (you cannot assign the number 2 into
a variable without any name), you should rather use ""==2 (as documented
in ?plotmath).

Uwe Ligges


> It seems that NULL>=something is prefered to "">=something,isn't it?
> 
>> version
> 
>               _
> platform       i386-pc-mingw32
> arch           i386
> os             mingw32
> system         i386, mingw32
> status
> major          2
> minor          3.0
> year           2006
> month          04
> day            24
> svn rev        37909
> language       R
> version.string Version 2.3.0 (2006-04-24)
> 
>> > ______________________________________________
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>> > https://stat.ethz.ch/mailman/listinfo/r-help
>> > PLEASE do read the posting guide! 
>> http://www.R-project.org/posting-guide.html
>>
>> ______________________________________________
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>> PLEASE do read the posting guide! 
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>>
> 
> 
> -- 
> »ÆÈÙ¹ó
> Deparment of Sociology
> Fudan University