I was looking at the examples in the `optim' help page and I think one of
them does not quite work. In particular, this example:
## "wild" function , global minimum at about -15.81515
fw <- function (x)
10*sin(0.3*x)*sin(1.3*x^2) + 0.00001*x^4 + 0.2*x+80
plot(fw, -50, 50, n=1000, main = "optim() minimising `wild function'")
While it executes, I think it produces the wrong plot. The call to plot
indicates that it should be plotted from x values of -50 to 50 but the
resulting plot goes from 0 to 50. However, if I call
plot.function(fw, -50, 50, n = 1000,
main = "optim() minimising `wild function'")
then that plot appears to be correct. I figured this had something to do
with the method dispatching on functions.
This occurs when I do a --vanilla startup.
> version
_
platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status Under development (unstable)
major 1
minor 7.0
year 2003
month 01
day 21
language R
-roger
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