On Jan 2, 2011, at 1:15 PM, Ben Bolker wrote:
Victor F Seabra <vseabra <at> uol.com.br> writes:
Please, I wonder if someone knows how to add the
less than or equal to symbol in the plot generated by the code
below:
var1<-c('age <= 3','age <= 7','age <= 10','age <= 11','age <=
20','age <=
25','age <= 30','age <= 45','age <= 50','age < 55','age >= 55')
var2<-c(3.8,5.4,3.7,3.8,5.9,6.4,7.2,8.4,10.5,1.3,0.7)
table1<-data.frame(var1, var2)
plot(x=table1$var2,y=1:11,xlim=c(0,20),pch=20)
text(x=table1$var2,y=1:11,table1$var1,pos=4)
title(x=15,y=5,expression("how to substitute the < = with the
" <=
"symbol"),font=5)
Please, note that the data must come from a table (not manually
fed in a
text command)
I received help yesterday and learned a fix using
\u2264, eval, parse, and sprintf but the symbols generated by
this fix are
not exported to an .EPS file
Kind regards,
This is a little bit more 'magic' than I would like, but seems
to work. Perhaps someone else can suggest a cleaner solution.
Here's the best I could come up with but will admit that there were
many failed attempts before success:
expr.vec <- as.expression(parse(text=table1$var1))
plot(x=table1$var2 ,y=1:11, xlim=c(0,20), pch=20)
text(x=table1$var2, y=1:11, labels=expr.vec, pos=4)
title(x=15, y=5, expression("Yet another way to process strings with
operators like '<=' )
(The title expression works on my machine, but perhaps not on the OP's
machine, given differences in encoding that have so far been exhibited.)
ages <- gsub("[^0-9]+","",table1$var1)
rel <- gsub("age\\s*([=<>]+)\\s*[0-9]+","\\1",table1$var1,perl=TRUE)
with(table1,plot(var2,1:11,xlim=c(0,20),pch=20))
invisible(with(table1,
mapply(function(x,y,a,r) {
text(x=x,y=y,
switch(r,
`<=`=bquote(age <= .(a)),
`<`=bquote(age < .(a)),
`>=`=bquote(age >= .(a))),
pos=4)},
var2,1:11,ages,rel)))
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and provide commented, minimal, self-contained, reproducible code.
