R help - Jun 1999 - mathematics in R graphics

I was reading Chapter 2 of the R manual that came with 64.1, but
couldn't get the behavior out of expressions as described in the
manual.  Is there any example on the subject?  For example, "x sub i"
is supposed to be produced by "x[i]", but where to put it?  I tried
mtext(text=x[i]) and R simply interprets that as a regular expression.

Thanks in advance for any clue that may help.

Chong Gu
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On Wed, 23 Jun 1999, Chong Gu wrote:
> 
> I was reading Chapter 2 of the R manual that came with 64.1, but
> couldn't get the behavior out of expressions as described in the
> manual.  Is there any example on the subject?  For example, "x sub
i"
> is supposed to be produced by "x[i]", but where to put it?  I
tried
> mtext(text=x[i]) and R simply interprets that as a regular expression.
You need
	mtext(text=expression(x[i]))


Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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