Displaying 20 results from an estimated 2000 matches similar to: "Generalized Singular Value Decomposition (GSVD)"
2011 Nov 30
2
Generalized singular value decomposition
Hello,
I would like to perform a generalized singular value decomposition with
R. The only possibility I found is "GSVD" that is based on LAPACK/BLAS.
Are there other possibilities too?
If not, has anybody used LAPACK/BLAS under Windows XP? How can I install
them? Following [1] did not help.
I hope this is the right place for my question.
Thank you very much!
Oana Tomescu
[1]
2007 Sep 20
1
problem with generalized singular value decomposition using LAPACK
Hi All,
I'm trying to run generalized singular value decomposition (GSVD) function
from LAPACK library. Basically my problem is that I can not run it for large
matrices, I get a memory error.
I'm using R 2.5.1. I tried this on intel centos5 machines with 2 GB memory
and 8 GB memory. I have unlimited max memory,cpu time and virtual memory.
LAPACK is already compiled for R
2013 Apr 19
3
extracting the diagonal of an inverse matrix
Dear R-users,
I would like to know whether there is a way to extract a diagonal of an inverse matrix without computing the inverse of the matrix itself. The size of my matrices are really huge and, also using sparse matrix, computing the inverse leads to storage problems and low speed.
In other words, given a square matrix A, I aim to know diag(B), where B=solve(A), without computing solve(A).
2004 Aug 10
1
persp, array and colors
Dear R-users,
I'd like to plot a three-dimensional surface and at the meantime I'm using
an array. I would like to have the values of my first matrix in the heights
of the plot and the colors of the single facet taking into account the
second matrix.
I hope that the next code will help all of you to understand better my
issue,
Thanks in advance, Giancarlo
############################
##
2012 Apr 05
1
xyplot with different pch and col in each panel and additional line
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indicato...
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2006 Jan 30
3
Subsetting a matrix without for-loop
Dear R-users,
I'm struggling in R in order to "squeeze" a matrix without using a
for-loop.
Although my case is a bit more complex, the following example should
help you to understand what I would like to do, but without the slow
for-loop.
Thanks in advance,
Carlo Giovanni Camarda
A <- matrix(1:54, ncol=6) # my original matrix
A.new <- matrix(nrow=3, ncol=6) # a new
2006 Jul 28
2
Extracting from a matrix w/o for-loop
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Url: https://stat.ethz.ch/pipermail/r-help/attachments/20060728/957eb23c/attachment.pl
2006 Sep 01
1
Help with singular value decomposition
Hi wizards, I have seen the function svd of R for singular value
decomposition, but I need to computes the ``economy size'' or ``thin''
singular value decomposition of a matrix in R. Somebody knows how to
do that?. Thanks in advance.
--
Web Page
http://geocities.com/lord_tyranus_96/
2006 Apr 26
0
Generalized SVD
Hi,
I need to computed the GSVD of two matrices. For doing so I used in my C
code the lapack routine dggsvd. But when I source my file gsvd.R I have
the following error:
Error in eval.with.vis(expr, envir, enclos) :
BLAS/LAPACK routine 'DGGSVD' gave error code -1
Is there a problem with the parameters passed through the gsvd.R script?
Is there a problem within the C script?
2005 May 15
1
Save parameters from optim during iteration procedure
Dear R-users,
I am going to try to be as clearer as possible, showing also an example.
1) I have a function (in my real case it's much more complex)
2) I use "optim" to minimize
3) I want to use as method L-BFGS-B for several reasons
4) I know I could use "trace=6" (in "control") in order to see "live"
the procedure
5) I would like to see separately the
2006 May 16
1
optim with specific constraints on possible values
Dear R-users,
I am working with some grid-search optimization for 13 values of an
object function.
At glance one may compute the object function for each possible
combination of set of parameters, but in my case would not be feasible:
taking for example 13 possible values for each parameters like, in
logarithm scale, 10^seq(-3,3,.5) will lead to 13^13 combinations of
results.
As a second trial
2005 Oct 12
1
Historical England and Wales Shape Files
Dear R-user,
I would like to apply spatial statistics on some historical data, in
particular from 1850 to 1900 by registration district of England and
Wales.
I have searched in the R-archive, but unsuccessfully.
Do you know whether R contains those shape files? Or where would be
possible to download and use in R?
Thanks in advance,
Carlo Giovanni Camarda
+++++
This mail has been sent through the
2004 Jul 30
1
optimisation procedure with flat log-likelihood
Dear R-friends,
I use
optim(par=c(mystartingpoints), fn=myloglikelihoodfunction, gr=NULL,
method=c("L-BFGS-B"), ## I would like to do not use any
bounds
control=list(trace=6, ## just to see what it's going on
maxit=c(20000)), ## to be sure the it
doesn't stop reaching the max iterations
2005 Oct 18
1
Solid and dotted lines saving an xyplot
Dear R-users,
I would a small problem saving a graph with postscript after using
xyplot.
Whereas in the R-screen the two lines are solid, once the image is saved
as .eps file the second lines (blue in the following example) is dotted.
Here there is a simple example.
Thanks in advance for your help,
Carlo Giovanni Camarda
# creating data
a1 <- sort(runif(10))
a2 <- sort(runif(10))
a3 <-
2005 Jun 14
2
Plotting rows (or columns) from a matrix in different graphs, not using "par"
Dear R-users,
I would like to ask whether it's possible (for sure it would be), to
plot each rows (or columns) in different graphs and in the same figure
region without using the function "par" and then struggling around with
"axes" and labels etc.
Luckily, I would always have "rows + columns = even number" and the same
"ylim".
The next one could be a
2006 May 09
2
draw a graphic using segments to represent data
Hello,
I'd like to draw a graphic using different color line segments to
represent microarray data. It simply likes this:
Data=cbind(c(1, 2, -1, 3, -2.2), c(1, 3, -1, -1.8, 4))
The first col No represents y'axis position (negative down and positive
up). The second col No represents a length of segment (negative segment
should be on left of y, and positive on right). Also the
2010 Sep 29
1
generalized additive mixed models for ordinal data
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2006 Apr 28
2
How to get a grid behind a boxplot
I am using R 2.2.1 on a Windows 2000 PC.
When I do a grid() after the boxplot
it overprints the boxplot:
> boxplot(count ~ spray, data = InsectSprays, col = "lightgray")
> grid(nx=NA, ny=NULL)
>
if I try the panel.first
> boxplot(count ~ spray, data = InsectSprays, col = "lightgray",
+ panel.first=grid(nx=NA, ny=NULL))
>
I can see the grid flash
2006 Feb 01
1
glm-logistic on discrete-time methods with individual and aggregated data
Dear R-Users,
without going into details I tried to prepare a simple example to show
you where I would need help.
In particular I prepare two examples-template for a study I'm conduction
on discrete-time methods for survival analysis.
Each of this example has two datasets which are basically equal, with
the exception that in the former one has individual data and in the
latter one aggregated
2010 Jan 02
0
Query: sampling from a multivariate normal distribution using the singular value decomposition
Dear R-list users,
this question is not strictly related to R, but hopefully somebody will be able to answer.
In a schematic way, which is the algorithm to sample from a multivariate normal distribution using the singular value decomposition?
thank you for your help
Stefano
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