[R] math symbols in plot legend
Ott Toomet
siim at obs.ee
Wed May 8 09:11:56 CEST 2002
Hi,
I have tried to include a description into legend which includes
mathematical symbols and actual values. Basically, I want something like
> legend(0.5,1,
legend=c(expression(gamma==0.2),
expression(gamma==1),
expression(gamma==5)),
lty=1:3)
Where gamma should be the greek letter.
The problem is that the actual numeric values can change and the number of
expressions can change too. I have tried to build a vector of expressions
something like
leg <- NULL
for(i in seq(along=g)) {
leg <- c(leg, substitute(expression(gamma==gam), list(gam=g[i])))
}
but this results into a list and not vector of expressions (however,
component expressions are correct). My attempts to
convert it with as.expressions() and similar are not been fruitful so long.
I am using R 1.4.0 on linux.
Any suggestions?
Ott Toomet
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