[R] numerical subscripts in a loop in a plot

David Winsemius dwinsemius at comcast.net
Mon Feb 1 18:59:19 CET 2010

On Feb 1, 2010, at 12:40 PM, Alexander Nervedi wrote:

> Hi R Graphics Gurus
> I am unable to figure out this issues with unevaluated expressions.  
> I'm trying to create a graphic where I calculate the residual from a  
> regression and want to mark each residual with its observation  
> number. So something like
> plot(0,0, type = "n", xlim = c(0,10))
> for(i in 1:10){
>   text(i, 0, substitute(paste(epsilon[i])))
> }

Does this work for you:

plot(0,0, type = "n", xlim = c(0,10))
for(i in 1:10){
   text(i, 0, substitute(epsilon[i], list(i=i) ))


It doesn't for me, in that it doe not print the correct epsilon glyph,  
but that's because my access to the Symbol font is messed up on my Mac  
for a reason that is not pressing enough to warrant a question to the  
appropriate help list. It does get the subscripts printing correctly  
beneath empty square boxes.

> except that i end up pasting \epsilon_i 10 times and not  
> \epsilon_1, ..., \epsilon_10. i'd be much obliged if anyone can put  
> me out of my misery and let me know how i am goofing up.
> many thanks
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT

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