Hi Bob,
On Nov 5, 2009, at 3:04 PM, <robertag...@discover.com> <robertag...@discover.com
> wrote:
I am missing something fundamental. I ran the function nlm, but I
don't
understand how to extract the optimal solution as a numeric vector.
The
function produces it as one element of a list. I don't see anything
in
the R documentation about converting such a list element to the
vector it
displays.
Are you just asking how to pull out the appropriate parts of the
returned value from the nlm function call?
Taking code from the Example section of ?nlm, run this:
R> f <- function(x, a) sum((x-a)^2)
R> r <- nlm(f, c(10,10), a=c(3,5))
Now look at "r"
R> r
$minimum
[1] 3.371781e-25
$estimate
[1] 3 5
$gradient
[1] 6.750156e-13 -9.450218e-13
$code
[1] 1
$iterations
[1] 2
To get the minimum, or estimate you just access it like:
R> r$minimum
[1] 3.371781e-25
R> r$estimate
[1] 3 5
Is this what you're asking?
-steve
ps:
r[['minimum']] and r[['estimate']] would also work, as would r[[1]]
and r[[2]]
--
Steve Lianoglou
Graduate Student: Computational Systems Biology
| Memorial Sloan-Kettering Cancer Center
| Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact
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