Displaying 20 results from an estimated 2000 matches similar to: "Mathematica and R"
2010 Jul 14
3
Convergent series
What are some reliable R functions that can compute the value of a
convergent series?
David
--
David R. Bickel, PhD
Associate Professor
Ottawa Institute of Systems Biology
Biochem., Micro. and I. Department
Mathematics and Statistics Department
University of Ottawa
451 Smyth Road
Ottawa, Ontario K1H 8M5
http://www.statomics.com
Office Tel: (613) 562-5800 ext. 8670
Office Fax: (613) 562-5185
2010 Jul 08
2
package installation for Windows 7
Neither biocLite nor the GUI menus can install packages on my system.
Here is relevant output:
> version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 2
minor 11.1
year 2010
month 05
day 31
svn rev 52157
language R
version.string R version 2.11.1 (2010-05-31)
> source("http://bioconductor.org/biocLite.R")
BioC_mirror =
2007 Dec 10
3
3-D plot of likelihood
Could anyone recommend a package for visualizing a likelihood function
of two scalar parameters? I would prefer a three-dimensional plot
similar to the kind Mathematica is known for, perhaps generated by a
package not specific to likelihood.
David
______________________________
David R. Bickel
Ottawa Institute of Systems Biology
BMI Dept., University of Ottawa
http://www.oisb.ca/members.htm
2007 Oct 30
1
high RAM on Linux or Solaris platform
To help me make choices regarding a platform for running high-memory R
processes in parallel, I would appreciate any responses to these
questions:
1. Does the amount of RAM available to an R session depend on the
processor (Intel vs. Sun) or on the OS (various Linux distributions vs.
Solaris)?
2. Does R have any built-in limitations of RAM available to a session?
For example, could it make use
2006 Sep 29
2
GLM information matrix
Is there a function that provides the Fisher information matrix for a
generalized linear model? I do not see how to access the off-diagonal
matrix elements of the value returned by glm. (I'm particularly
interested in logistic regression.)
If not, what is a good way to use R to compute Hessians or other partial
derivatives of log likelihoods?
I would appreciate any guidance.
David
2004 Sep 03
2
debugging an S4 method
Does anyone know how to use the equivalent of debug() on an S4 method? I would like R to enter the browser not for the generic function, but for the method of the class that I specify.
Thanks,
David
_____________________________
David Bickel http://davidbickel.com
Research Scientist
Pioneer Hi-Bred International
Bioinformatics & Exploratory Research
7250 NW 62nd Ave., PO Box 552
Johnston,
2005 Feb 22
2
estimate the parameter of exponential distribution, etc.
Given a numeric vector of observations, does R have any generic way to estimate the parameters of commonly used distributions (exponential, gamma, etc.) without numerically optimizing the likelihood function?
Thanks,
David
_______________________________________
David R. Bickel http://davidbickel.com
Research Scientist
Pioneer Hi-Bred International
Bioinformatics & Exploratory Research
7250
2004 Aug 31
2
enter browser on error
Is there a way I can get R to automatically enter the browser inside a user-defined function on the generation of an error? Specifically, I'm trying to debug this:
Error in as.double.default(sapply(lis, FUN)) :
(list) object cannot be coerced to double
In addition: There were 38 warnings (use warnings() to see them)
> traceback()
8: as.double.default(sapply(lis, FUN))
7:
2005 Dec 23
2
convolution of the double exponential distribution
Is there any R function that computes the convolution of the double
exponential distribution?
If not, is there a good way to integrate ((q+x)^n)*exp(-2x) over x from
0 to Inf for any value of q and for any positive integer n? I need to
perform the integration within a function with q and n as arguments. The
function integrate() is giving me this message:
"evaluation of function gave a
2004 May 05
1
Installation on Windows XP
R never gave me any serious problems until I tried to use it on Windows XP. I had 1.8.1 installed and working successfully for a few weeks. This morning when I launched it, I received this error message: "R for Windows GUI front-end has encountered a problem and needs to close. We are sorry for the inconvenience."
I downloaded 1.9.0 and installed it, but when I launch it, I get this
2008 Jan 09
3
likelihood from test result
Is there any automatic mechanism for extracting a likelihood or test
statistic distribution (PDF or CDF) from an object of class "htest" or
from another object of a general class encoding a hypothesis test
result?
I would like to have a function that takes "x", an object of class
"htest", as its only argument and that returns the likelihood or test
statistic
2004 May 27
2
axis.POSIXct: Datetime data and plotting
I've run into a problem with the datetime axis generated by axis.POSIXct. It appears a similar issue was discussed in October 2003 under the subject line "datetime data and plotting" (see https://stat.ethz.ch/pipermail/r-help/2003-October/039071.html), but I wasn't able to determine whether there is a straightforward solution.
The code below produces a graph with apparently
2004 Jun 14
4
interrupt in Linux
Does anyone know how to interrupt R in RedHat? Neither control-c nor Esc is working. What I don't want to do is close the window or kill the entire R process.
Thanks,
David
This communication is for use by the intended recipient and ...{{dropped}}
2011 Feb 04
3
shade between two curves
Is there a function that can shade the region between two arbitrary
curves? For example, how can I fill in the area between these two
plotted curves?
> x <- 1:10
> y <- x + rnorm(10)
> z <- x + 10 + rnorm(10)
> plot(x, y, type = "l", ylim = c(0,20))
> lines(x, z)
I would appreciate any help.
David
2007 Jun 22
3
How to run "mathematica" or "c" programs in R?
I have some programs which were writen in mathematica or c language, but I
donot know how to use these software. So I want to run them in R.
Can I do it ?
How to run "mathematica" or "c" programs in R?
Jian Zhang
[[alternative HTML version deleted]]
2010 Jul 17
2
re. Mathematica and R
David - information on calling R from within Mathematica can be found at the
following link:
http://www.mofeel.net/1164-comp-soft-sys-math-mathematica/13022.aspx
HTH,
Alan Kelly
2012 Mar 08
1
Doing Mathematica Quantile[] function in R
Hi all,
I am an R newbie trying to do some calculations I do in Mathematica in
R on a GNU/Linux system.
The main thing I am interested in doing is taking a 0.999 quantile on
a data set in a file who's data is normally distributed, say foo.csv.
e.g in Mathematica if I have something like this :
a=Import["foo.csv"]
b=Transpose[a][[1]]
Quantile[b,0.999]
In R I can load all the data
2006 Aug 07
1
mathematica -> r (gamma function + integration)
Dear R-list,
I try to transform a mathematica script to R.
#######relevant part of the Mathematica script
(* p_sv *)
dd = NN (DsD - DD^2);
lownum = NN (L-DD)^2;
upnum = NN (H-DD)^2;
low = lownum/(2s^2);
up = upnum/(2s^2);
psv = NIntegrate[1/(s^NN) Exp[-dd/(2s^2)]
(Gamma[1/2,0,up] + Gamma[1/2,0,low]),{s,sL,sH},
MinRecursion->3];
PSV = psv/Sqrt[2NN];
Print["------------- Results
2006 Oct 16
1
The old question: R vs MATLAB vs Mathematica vs ...
Hi,
This question seems to be old, however I am asking it from a different point
of view.
R introduces itself as a 'statistical' language and environment. There are
many discussions about comparing R to MATLAB or mathematica (or other
similar software). It seems to me that these other software have a broader
range of applications. For example, in Mathematica one can solve a partial
2004 Aug 02
2
random seed puzzle
After reading the help page on set.seed, I am unsure about how to solve the following problem. I need to call function f a thousand times. The list of values returned by f, should be as random as possible. f calls g twice:
f <- function(){g1 <- g(1); g2 <- g(2); c(g1; g2)}
The function g in turn calls sample and returns a number, but also depends on its argument, so, starting from the