Displaying 6 results from an estimated 6 matches for "_numerical".
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numerical
2007 Jun 23
1
putting binary files in a package
I have some binaries I would like to distribute with a package
(I am not the original author; I have the source code but can't distribute
it because it contains _Numerical Recipes_ code. The long-term
solution is to replace the code with new code written in R, or
in clean C, but in the meantime ...)
I'm uncertain both where they ought to go and where they
will work (and hoping there is someplace that will satisfy
both). I had them in the exec/ directory: ac...
2009 Apr 20
1
Two or more dimensional root (Zero) finding
Good morning to all,
I should find the zero of a specific function with
respect to a vector of arguments.
Does it exist something similar in R?
Thank
you very much,
Enrico Foscolo
2009 Nov 30
3
Question about output from optim
Dear R-users,
I am trying to port to R something that I wrote in Matlab to perform model
parameter optimization using the Nelder-Mead simplex method (fminsearch). I
read the help on ?optim (which seems to be the way to go) as well as a bunch
of posts on the topic, but I would like to make sure about something before
I spend to much time trying to reproduce something that is not possible. The
2006 Sep 08
1
Computing skewness and kurtosis with the moments package
Hi,
I'm a newcomer to R, having previously used SPSS. One problem I have
run into is computing kurtosis. A test dataset is here:
http://www.whinlatter.ukfsn.org/2401.dat
> library(moments)
> data <- read.table("2401.dat", header=T)
> attach(data)
> loglen <- log10(Length)
With SPSS, I get
Skewness -0.320
Kurtosis -1.138
With R:
> skewness(loglen)
[1]
2000 Nov 08
3
Strange means of numbers drawn from rpois
Dear all,
I think I must be going crazy.... If I do
> mean(rpois(1000000, 14))
I get:
[1] 13.50420
and again:
> mean(rpois(1000000, 14))
[1] 13.49896
> mean(rpois(1000000, 14))
[1] 13.50161
> mean(rpois(1000000, 15))
[1] 14.49250
> mean(rpois(1000000, 15))
[1] 14.49897
> mean(rpois(1000000, 14.5))
[1] 13.99689
> mean(rpois(1000000, 14.5))
[1] 13.9963
This was on a
platform
2010 Jul 05
3
selection of optim parameters
Hi all,
I am trying to rebuild the results of a study using a different data
set. I'm using about 450 observations. The code I've written seems to
work well, but I have some troubles minimizing the negative of the
LogLikelyhood function using 5 free parameters.
As starting values I am using the result of the paper I am rebuiling.
The system.time of the calculation of the function is