Displaying 20 results from an estimated 1300 matches similar to: "A question about positive definite matrix"
2008 Oct 23
15
VEC Operator in R
Can anyone please tell whether there is any R function to act as "VEC" and
"VECH" operator on Matrix? Yes of course, I can write a
user-defined-function for that or else, I can put dim(mat) <- NULL. However
I am looking for some R function.
Your help will be highly appreciated.
Regards,
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2008 Oct 23
1
Calculating confidence limits for the difference betweenmeans
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Subject: Re: [R] Calculating confidence limits for the difference between means
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2008 Oct 23
3
xy.coords in text
Hello,
I want to add text annotation about correlation on "pairs" plots. I
found that I could pass a function to the "panel" argument of pairs :
panel.annot <- function(x, y, ...) {
points(x, y, ...)
c <- cor.test(x, y)
legend("topleft", legend=substitute(rho == r, list(r=sprintf("%.2f",
c$estimate))), bty="n")
}
And then :
2008 Oct 22
3
Help finding the proper function
This might not be the correct forum for this question for there might be some
flaws in my logic so the R function I'm looking for might not be the
correct, but I know there?s a lot of smart people in this forum so please
correct me if I'm wrong. I have been googling and searching in this forum
for something useful but so far I'm out of luck.
This is the background to my problem. I
2016 Oct 19
2
SSH Weak Ciphers
On 10/19/2016 01:54 PM, m.roth at 5-cent.us wrote:
> Alice Wonder wrote:
>> On 10/19/2016 11:34 AM, Leonard den Ottolander wrote:
>>> Hello Gordon,
>>>
>> *snip*
>>>
>>> Personally I would be more concerned whether or not to enable ECDSA
>>> algorithms (https://blog.cr.yp.to/20140323-ecdsa.html).
>>>
>> For web server ECDSA
2008 Oct 23
2
I have an xyplot, I want to keep the format, but only show x or y
Good Morning,
I am using xyplot to show two variables for a large number of
subjects.
Currently I am using xyplot(y~x|as.factor(ID), layout=c(7,9)) to
give me a little plot of the x and y factors for each ID.
The purpose of the plot is to let the PI quickly look through the
data for irregularities.
The good news is that they like the layout of the xyplot, but they
don't want to have to
2008 Oct 23
4
odfWeave error
odfWeave is throwing up a cryptic error, after successfully processing a
file with a large number of figures (~30) and many \Sexpr{} calls. The
error is (at least to me) cryptic. I am not sure where to look to
correct this problem.
Here's the error:
Post-processing the contents
Error in .Call("RS_XML_Parse", file, handlers, endElementHandlers,
as.logical(addContext), :
2008 Oct 22
3
Substitute problem
hello R users,
I didn't find a solution for a special problem.
I have two dataframes.
dataframe1:
X value row col ID
1 8.973498062 5512625 3460000 1
2 11.656658570 5501625 3464000 2
3 11.121777570 5495625 3473000 3
4 9.310465964 5508625 3477000 4
5 8.883483845 5515625 3496000 5
dataframe2:
X value
2006 Apr 29
1
Textile to LaTeX
Hello,
Is there a patch laying around somewhere to convert
Textile to LaTeX? (Instiki did/does this?)
Or, better yet, is RedCloth 3.1 still in the pipeline?
In ruby-talk 129874 (7 Feb 2005), why the lucky stiff wrote:
>
> Let me give you a roadmap of what to expect with RedCloth 3
> in the coming months.
>
> RedCloth 3.1 will focus on getting us diverse outputs.
2008 Oct 23
1
[R-SIG-Finance] forecasting earnings, sales and gross margin of a company...
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Subject: Re: [R] [R-SIG-Finance] forecasting earnings, sales and gross margin of a company...
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2007 Feb 12
1
yum behinf authenticated proxy
Hi,
I've just installed a CentOS 4.4 and i'm behind a proxy with authentication.
Does anyone know the parameters for the environment variable
"http_proxy" so i can make a "yum update" ?
Usually i'd do a
$ export http_proxy="proxy.domaion.foo:3128"
but this is not the case of an authenticated proxy.
Any help would be appreciated.
Warm Regards,
M?rio
2008 Oct 24
2
plotrix and prettyR
Hi folks,
Both plotrix and prettyR have been updated. plotrix now has the "Matlab"
style dotplot that was requested not long ago on the list, provided by
that intrepid duo, Barry Rowlingson and Rolf Turner. Mike Cheetham has
contributed an implementation of the Piper diagram, also in response to
a request. prettyR has finally learned how to display SPSS value labels
in the xtab and
2010 Nov 15
1
Non-positive definite cross-covariance matrices
I am creating covariance matrices from sets of points, and I am having
frequent problems where I create matrices that are non-positive
definite. I've started using the corpcor package, which was
specifically designed to address these types of problems. It has
solved many of my problems, but I still have one left.
One of the matrices I need to calculate is a cross-covariance matrix.
In other
2012 Feb 03
1
GAM (mgcv) warning: matrix not positive definite
Dear list,
I fitted the same GAM model using directly the function gam(mgcv) ... then
as a parameter of another function that capture the warnings messages (see
below).
In the first case, there is no warning message printed, but in the last
one, the function find two warning messages stating "matrix not positive
definite"
So my question is: Do I have to worry about those warnings and
2003 Mar 22
2
How to check a matrix is positive definite?
Hey, all
Given a square matrix, how can I check if this matrix
is positive definite or not?
Thanks.
Fred
2006 Jul 21
3
positive semi-definite matrix
I have a covariance matrix that is not positive semi-definite matrix and I
need it to be via some sort of adjustment. Is there any R routine or
package to help me do this?
Thanks, Roger
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2004 Sep 01
0
not positive definite D matrix in quadprog
Hello to everybody,
I have a quadratic programming problem that I am trying to solve by various
methods. One of them is to use the quadprog package in R.
When I check positive definiteness of the D matrix, I get that one of the
eigenvalues is negative of order 10^(-8). All the others are positive. When
I set this particular eigenvalue to 0.0 and I recheck the eigenvalues in R,
the last
2011 Jan 29
1
Positive Definite Matrix
Hello I am trying to determine wether a given matrix is symmetric and
positive matrix. The matrix has real valued elements.
I have been reading about the cholesky method and another method is to find
the eigenvalues. I cant understand how to implement either of the two. Can
someone point me to the right direction. I have used ?chol to see the help
but if the matrix is not positive definite it
2010 Aug 10
0
Error: the leading minor of order 6 is not positive definite
Hey guys,
I'm trying to run a Canonical Correlation Analysis (CCA) between two data
sets. But for my case I am dealing with data sets(which are stored as two
matrices X and Y) in which the number of experimental units is greater than
the number of variables, so I want to use a sample from my "mothdata" data
set which I store in a matrix called "Yr". I am using the cc()
2009 Apr 01
2
Need Advice on Matrix Not Positive Semi-Definite with cholesky decomposition
Dear fellow R Users:
I am doing a Cholesky decomposition on a correlation matrix and get error message
the matrix is not semi-definite.
Does anyone know:
1- a work around to this issue?
2- Is there any approach to try and figure out what vector might be co-linear with another in thr Matrix?
3- any way to perturb the data to work around this?
Thanks for any suggestions.