Hi Feng,
AFIK SVD analysis provides a one-step method for computing all the
components of the eigen value problem, without the need to compute and
store big covariance matrices. And also the resulting decomposition is
computationally more stable and robust.
Cheers,
Antonio Rodriguez
-
Hi!
I am a relatively new user of R and I use it to prepare my dissertation. I
have come to some very usefull and specific libraries written for S-PLUS 4
and would like to use them in R. Is that possible? I just found out that one
of these libraries has already been transfered to R, while 3
Andrej, you may need to be more explicit about the
precise capabilities that are lacking in R. For
instance, there is a package on CRAN called norm
that is based on work by Joseph Schafer. If you're
aware of this package and it doesn't do what you
want, perhaps there are others that do (survey,
Deborah,
Perhaps, a good idea is to use eps output to include it into a LaTeX
document, in this manner you can format and layout your graphics
exactly the way you want.
If you need more information, I'm ready for your disposal.
-Serge
__
[EMAIL
Laurent == Laurent Gautier [EMAIL PROTECTED]
on Thu, 6 Feb 2003 09:37:27 +0100 writes:
Laurent Dear all,
Laurent I am trying (without much success) to use the fuction 'silhouette'.
Laurent Would anyone encountered that before (or would know where I am wrong ?)
Lauren has sent
Hi R community,
These days, I am writing some functions to work with 2-ways frequency
tables ; you know all this tuff about measures of association: Chisq and
derived (phi, cramer's v), tau b, tau c, somer's d and so on.
So I consider all those functions could be gathered in a single R file,
This comes up from time to time; at the moment I can't find the thread
in the mailing list archives. The advantage, obviously, would be to make
all this accumulated code available to the R community. The disadvantage
would be that such a heap of code would be highly heterogeneous -- some
Being relatively new to R, I want to use R in connection with a MySQL database.
After installing (apparently sucessfully) the package RMySQL (R Version 1.6.2)
the result is as follows:
library(RMySQL)
con - dbConnect(MySQL(), dbname= test)
Error: couldn't find function dbConnect
Thank You
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of
[EMAIL PROTECTED]
Sent: Friday, February 07, 2003 9:47 AM
To: Sundar Dorai-Raj; [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: [R] Fw: Plotting in subareas using par(fig=) parameter
Sundar and
Dear All,
I am writing some code in C++ that I call from R (using .C). I would like to
have support for 2D and 3D arrays, including reading, assignment and
operations over whole columns, rows, and slices, etc (with linear algebra a
plus). In the past I have used Blitz++
In that case you have to download the ready-made packages from CRAN.
If you want to build additional ones, it can be done using CodeWarrior
or MPW, but you are basically one your own in the desolate reaches of
MacOS 9.x.
-- Jan
On Thursday, February 6, 2003, at 08:31 PM, Matt Davis wrote:
I
Thanks for those replies.
But I tested several cases, and found the two
percentage from SVD and EVD are not
the same.
So how to explain the difference and which
one should be the right one for use
in PCA?
- Original Message -
From: antonio rodriguez [EMAIL PROTECTED]
To: Feng Zhang
I am interested in building a model with a subset of data from a column.
The first 6 lines of my data look like this:
QUAD YEAR SITE TREAT HERB TILL PLANT SEED Kweed
1 A4 2002s 1NN NN 55.00
2A10 2002s 1NN NN 60.00
3 B2 2002
You might want to try subsetting the data frame first, and then fit the
model. Something like
knap.sub - knap[c(41:60,81:100,101:120,121:140), ]
knap.fit1 - lm(Kweed ~ TREAT, data = knap.sub)
might work for you.
-roger
___
UCLA Department of Statistics
[EMAIL
I used Matlab to do this case study.
x = randn(200,3); %%generating a 200x3 Gaussian matrix
[a,b,c]=svd(x); %%SVD composition
S=diag(b)
S =[15.6765 14.8674 13.4016]'
S(1)^2/sum(S.^2);
0.3802
ZeroedX = X - repmat(mean(X),200,1); %%ZeroedX is now zero centered data
C = cov(ZeroedX);
Hi All.
I am quite a newbie to R.
This is a basic question.
I like to modify elements of a vector.
For Example:
a1 - c(1,2,3,4,3,5)
TThe following program sentence does not work but the intention is;
if (a1==3) a1*3 .
3 in the vector should be changed to 9, and
the resulted vector is
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