On Aug 22, 2012, at 2:46 PM, Noia Raindrops wrote:
Hello,
Use 'parse' for converting from character to expression:
x <- c(100, 50, 10, 1, 0.1, 0.05, 0.001)
plot(log(x), yaxt = "n")
parse(text = sprintf("e^%d", axTicks(2)))
## expression(e^-6, e^-4, e^-2, e^0, e^2, e^4)
axis(2, at = axTicks(2), labels = parse(text = sprintf("e^%d",
axTicks(2))), las = 1)
Here's a "parse-free" approach:
axis(2, at = axTicks(2), labels =
as.expression( sapply( axTicks(2), function(x)
bquote(e^.(x)))),
las = 1)
I have not found a case that makes one approach superior, although
there seems to be an avoid-parse sentiment abroad in the R-cognoscenti.
--
David Winsemius, MD
Alameda, CA, USA
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