[R] Subscript in axis label

[Tobias Verbeke]

pm509 at york.ac.uk wrote:
> Dear R help list members,
> 
> I am experiencing difficulty in trying to generate a subscript '2' in an 
> axis label. Although I can get the '2' into a subscript using expression(), 
> R then forces me to leave at least one space between the '2' and the 
> following character. My label is supposed to read 'N2O concentration 
> (ppm)', and the space between the '2' and the 'O' makes it look rather 
> inelegant! My code is the following (the comments in it are there to stop 
> me forgetting what I have done, I am new to R):
> 
> postscript(file="/Users/patrickmartin/Documents/York Innova 
> Precision/N2Oinnova.eps", horizontal=FALSE, onefile=FALSE, height=4, 
> width=5, pointsize=10)
>> plot(n2o, lty=0, las=1, xlab="Time", ylab=expression(N[2]~"O 
>> concentration (ppm)")) points(n2o, pch=16) # suppresses line but adds 
>> points dev.off() # turns postscript device off again

Is this better

plot(1:10, ylab = expression(paste(N[2],"O concentration (ppm)",
                              sep = "")))

?

HTH,
Tobias

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