Displaying 20 results from an estimated 40000 matches similar to: "C++ and R"
2002 Oct 11
2
No subject
Subject: activity of CPU used by R
X-Mailer: VM 7.00 under 21.4 (patch 6) "Common Lisp" XEmacs Lucid
Reply-To: fjmolina at lbl.gov
FCC: ~/mail/sent
My R processes never use more than 50% of my CPU activity. Is there any way I can make
them use more of it?
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read
2003 Jul 22
3
R and C++ compared with only C++
My computer is a pentium 4 running at 2.4 GHz.
My R is 1.7.1
I have written a program in R that calls C++. The program spends most of the
time in C++ ( > 90% ). R basically deals with output and input.
How slower can this be compared with the program I would get from rewriting
everything in C++?
Thank you.
2002 Jul 18
1
a bug?
I am having problems to use the command curve with a function of the
form
min ( f ( x ), g ( x ))
If I try with the function
myFunction <- function ( x ) if ( f ( x ) > g ( x )) f ( x ) else g ( x
)
I also have problems.
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send
2002 Mar 17
5
compute variance of every column in a matrix without a loop
Is it possible to compute the variance of every column in a matrix
without a loop?
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
2002 Oct 28
1
Nealder Meade and nlm
Hello,
I have been using R to fit my data using non-linear least squares. I
have used the optimize routine to minimize the sum of squared errors
(using Nealder Meade optimization routine), but couldn't get the
non-linear model in R to converge to the estimates acheived in a
convergent Neadler Meade routine. It tells me about problems with the
gradient. I was wondering if there is any way
2003 Apr 22
7
Subject: Eliminate repeated components from a vector
X-Mailer: VM 7.00 under 21.4 (patch 6) "Common Lisp" XEmacs Lucid
Reply-To: fjmolina at lbl.gov
FCC: /home/f/.xemacs/mail/sent
Does anyone know how I can eliminate repeated elements from a vector?
2002 Nov 19
4
fast way to check an object is a member of a list?
Is there any fast way to check that an object is a member of a list?
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
2002 Mar 11
2
gif, jpeg and png image files reader
Hi all,
Although R seems to have jpeg() and png() functions that converts data into
jpeg and png formated files, it
doesn't have functions the other way around.
Does one of R contributed packages have gif, jpeg and png image readers? I
did help.search() but no luck
Regards,
Jonathan
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read
2003 Sep 24
1
weird behaviour when calling c++
I am using 1.7.1 in a PC ( redhat 9, linux )
I created a subroutine in C++, mySubrutine, to be used in R. To debug this
subroutine I have a main routine in C++ that calls mySubrutine. The only thing main () does is to provide mySubrutine with its
arguments
(this is the easiest way for me to debug subroutines written in
C++ and intended to be used in R ).
I also have a version of the same
2002 Mar 07
1
integrate function
After finding an error in R's integrate function, I spent some time testing
various alternative numerical integration routines I took from the
Numerical Recipes book by Press et al. Here is a brief summary of what I found.
As near as I can tell, no method for numerical integration is foolproof. I
believe that no matter the method, functions could be invented to defeat
it. In particular,
2004 Jan 30
7
Detect the presence of an object
Is there a function like "is.there" such that
is.there ( a ) returns TRUE is object 'a' is in the current environment and
FALSE otherwise?
Thank you.
Francisco J. Molina
2003 Jan 13
2
Bug in boxplot(..., add=TRUE) ?
R 1.6.1 on Windows NT4:
The boxplot() function appears to draw its own tick marks
and axis values even when called with add=TRUE. As a toy
example, try
x <- rnorm(100)
f <- factor(rep(1:4, each=25))
plot(c(0,4), c(-3,3), type="n", xaxt="n", yaxt="n")
boxplot(x ~ f, add=TRUE)
My expectation is that a high-level plotting function will
not mess with the axes
2002 Dec 30
2
Writing packages with `methods' package
I'm trying to write a package which uses classes/methods as defined in the
`methods' package. I have a single .R file which defines the class and
various methods for that class. At the top of the file I have
require(methods)
and then
setClass("myclass", ...)
setGeneric("intersect")
setMethod("intersect", "myclass", function(x,y) ...)
I noticed
2002 Mar 13
3
Error: subscript out of bounds
How can locate in my program an error of that kind (Error: subscript
out of bounds)?
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
2002 Jul 26
5
Is there a function for finding local extrema.
I have a vector with about 100.000 values representing a quite regular
function (sinusoid like).
I would like to find all local maxima of this function (should be about
4000). Is there a native routine for R?
Thanks in advance
Eryk.
--
_|_ \|/ \|/ Eryk Witold Wolski tel :0049-(0)30-8413-1543 w w
?v? 'v? \'v'/ MPI Moleculare Genetik fax :0049-(0)30-8413-1139 |
2003 Feb 06
1
Call C routine problem
When I call C function from Splus, I often meet this problem:
"Problem: Couldn't find a function definition for "Stest" "
My c function is saved as 'test.c' (the function is also named as 'test'
My splus function is saved as 'Stest', such as
Stest <-
function(d,f)
{
.C("test",
as.integer(d),
as.single(f))
}
Assume my files (test.c
2003 Jan 15
2
Contour Plots
r-help,
I can't seem to get the below data organized in such a manner so as to
generate a contour plot
using any of the functions {lattice.contourplot, base.contour,
base.filled.contour}. I was wondering
if anyone could please tell me what I need to do to accomplish this.
X,Y,Level
-31.105,86.911,3843
-3.385,86.911,3896
24.335,86.911,3874
-24.175,79.700,3900
-3.385,79.700,3927
2003 Feb 11
2
geoR question from new R user
Hi,
I'm a new R user. My goal is to do a variogram using geoR.
I started by trying to do the example in the geoR Illustrative Session
using my own data.
I am able to read in my Ascii data using: D <- matrix(scan("file.dat",
n=530*3), 530,3, byrow=TRUE).
Then I use: as.geodata(D, coords.col=1:2, data.col=3) to make the
object D geodata.
I check the descriptive statistics,
2002 Feb 19
2
cdf of the standard normal distribution
Dear Experts,
I need to calculate the cdf of the standard normal distribution, i.e.
H(x) = 1/sqrt(2*pi) integral(exp(-z^2/2) dz), where z is b/w -infi to
infi.
I know there should be a way to do it in R, but did not know to do it.
I'd appreciate any help you could offer.
Charlie Liu
Graduate student intern at EPA/ECO
2003 Jan 16
7
X11 device now needs to be explicitly started?
_
platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status
major 1
minor 6.2
year 2003
month 01
day 10
language R
>
Until this version, I've not had to explicitly start the x11 device.
Now,