[R] help with sapply, plot, lines
Uzuner, Tolga
tolga.uzuner at csfb.com
Tue Dec 20 19:18:26 CET 2005
Hi,
I am trying to plot multiple lines on a graph.
The function is particularly simple:
sigma<-function(lambda) atm-2*rr*(lambda-0.5)+16*str*(lambda-0.5)^2
which uses the variables atm, rr and str...
I define these as such:
atm<-0.4
rr<-0.2
str<-0.1
and this plots fine:
plot(seq(0.01,0.99,0.01),sigma(seq(0.01,0.99,0.01)),ylim=c(0,1))
Now, I want to plot the same function for different values of str, as follows:
sapply(seq(0,0.3,0.05),function(s) {str<-s; lines(seq(0.01,0.99,0.01),sigma(seq(0.01,0.99,0.01)))})
Hoping that sigma will lexically scope into str and that lines will appear on the same plot as the one I first drew above.
Instead, I just get this:
> sapply(seq(0,0.3,0.05),function(s) {str<-s; lines(seq(0.01,0.99,0.01),sigma(seq(0.01,0.99,0.01)))})
[[1]]
NULL
[[2]]
NULL
[[3]]
NULL
[[4]]
NULL
[[5]]
NULL
[[6]]
NULL
[[7]]
NULL
and the plot does not change.
Any assistance appreciated.
Regards,
Tolga
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