Have you received a reply to this post? I couldn't find one, and I
couldn't find a solution, even though one must exist. I can get the
substitute to work in "main" but not "legend":
B <- 2:3
eB <- substitute(y==a*x^b, list(a=B[1], b=B[2]))
plot(1:2, 1:2, main=eB)
You should be able to construct it using "mtext", but I couldn't get
the desired result using legend.
hope this helps.
spencer graves
John Maindonald wrote:
> expression() accepts multiple expressions as arguments, thus:
>
> plot(1:2, 1:2)
> legend("topleft",
> expression(y == a * x^b,
> "where "* paste(y=="wood; ",
> x=="dbh")))
>
> Is there a way to do this when values are to be substituted
> for a and b? i.e., the first element of the legend argument
> to legend() becomes, effectively:
> substitute(y == a * x^b, list(a = B[1], b=B[2]))
>
> John Maindonald email: [EMAIL PROTECTED]
> phone : +61 2 (6125)3473 fax : +61 2(6125)5549
> Centre for Bioinformation Science, Room 1194,
> John Dedman Mathematical Sciences Building (Building 27)
> Australian National University, Canberra ACT 0200.
>
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