[R] plot labeling and expressions

From: Johannes Graumann <johannes_graumann_at_web.de>
Date: Tue, 15 Jan 2008 19:09:31 +0100


Hi all,

I'm trying to use an iteration that appends something to vector 'peaklabels' like so:
peaklabelNames <- append(

        peaklabelNames,
        substitute(i^{z+phantom()}*" ("*a*"AMU)",list(i="y2",z=2,a=0))
)
The vector is supposed to be used with 'text' to put labels on signals in an impulse plot.

While not vectorized

        substitute(i^{z+phantom()}*" ("*a*"AMU)",list(i="y2",z=2,a=0)) works for me, the vectorized form doesn't. The labels are represented as

        "y2"^2 (AMU)
(note the '"' in the printed string). Can anyone please give me a hint on how to resolve this?

Thanks, Joh



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