similar to: eigen(symmetric=TRUE) for complex matrices

Hi. I recently tried the following in R 2.5.1 on Windows XP: >ev2<-c(0.8,-0.6) >ev1<-c(0.6,0.8) >ev1%*%ev2 [,1] [1,] -2.664427e-17 >sum(ev1*ev2) [1] 0 > (I got the same result with R 2.4.1 on a different Windows XP machine.) I expect this issue is very familiar and probably has been discussed in this forum before. Can someone please point me to some

Hi: I create a hermitian matrix and then perform its singular value decomposition. But when I put it back, I don't get the original hermitian matrix. I am having the same problem with spectral value decomposition as well. I am using R 1.7.0 on Windows. Here is my code: X <- matrix(rnorm(16)+1i*rnorm(16),4) X <- X + t(X) X[upper.tri(X)] <- Conj(X[upper.tri(X)]) Y <-

Hello everybody When one is working with complex matrices, "transpose" very nearly always means *Hermitian* transpose, that is, A[i,j] <- Conj(A[j,i]). One often writes A^* for the Hermitian transpose. I have only once seen a "real-life" case where transposition does not occur simultaneously with complex conjugation. And I'm not 100% sure that that wasn't a

Hi I am getting error : Error in plot.new() : figure margins too large Can you please help -----code is ------------------------------------------------------------ temp <- seq(5500000/2, 22000000, 5500000/2) sV2 <- c(1, 1+temp[-length(temp)]) eV2 <- temp i=1 bitmap(paste("c:/vidhu/poster/poster_56half_2", LETTERS[i], ".png", sep = ""), "png256",

I'm trying to test if a correlation matrix is positive semidefinite. My understanding is that a matrix is positive semidefinite if it is Hermitian and all its eigenvalues are positive. The values in my correlation matrix are real and the layout means that it is symmetric. This seems to satisfy the Hermitian criterion so I figure that my real challenge is to check if the eigenvalues are all

--- test-data/phony-guests/Makefile.am | 3 +-- test-data/phony-guests/make-archlinux-img.sh | 4 ++-- test-data/phony-guests/make-coreos-img.sh | 10 ++++---- test-data/phony-guests/make-debian-img.sh | 10 ++++---- test-data/phony-guests/make-fedora-img.pl | 34 ++++++++++++++-------------- test-data/phony-guests/make-ubuntu-img.sh | 14 ++++++------

---------------------------------------------------------------------------- ---- FULL RSYNC LOG ---------------------------------------------------------------------------- ---- /usr/bin/rsync -av --force --delete-excluded --exclude-from=/usr/local/etc/snapback/snapback.exclude -e ssh --delete peru.cbm.mercyships.org:/ /home/backup/peru/hourly.0/ <bunch of lines deleted> wrote 873039

from ?eigen symmetric: if 'TRUE', the matrix is assumed to be symmetric (or Hermitian if complex) and only its lower triangle is used. If 'symmetric' is not specified, the matrix is inspected for symmetry. I think that could mislead a naive reader as it suggests that, with symmetric=TRUE, the result of eigen() (vectors and values) depends only on

We have a site that is running Mongrel and is down. Below is the Mongrel log file information. The server is a Linux server with 2gb of RAM. EV1 (hosting site) says that since this is a Linux server that the RAM is cached and that there is plenty of free memory available. Can anyone make sense of this error and have some suggestion of options that I may take to correct this issue and get

Fangrui Song via cfe-dev <cfe-dev at lists.llvm.org> writes: > > One property of "Squash and merge" is that it will add intermediate > commits as bullet points (`* `). In many cases the merger does not spend > more time cleaning up the description so a commit may look like: > > ``` > RFC: treat small negative λ as 0 for sqrt(::Hermitian) (#35057) > >

This thread reveals that R has some holes in the solution of some of the linear algebra problems that may arise. It looks like Jim Ramsay used a quick and dirty approach to the generalized eigenproblem by using B^(-1) %*% A, which is usually not too successful due to issues with condition of B and making a symmetric/Hermitian problem unsymmetric. In short, the problem is stated as follows:

On Fri, Sep 11, 2020 at 6:53 PM David Blaikie <dblaikie at gmail.com> wrote: > Is there any observable difference between "Squash and Merge" or "Rebase > and Merge" when "enforce linear history" is enabled, then? > "Squash and Merge" will only generate one commit. > > On Fri, Sep 11, 2020 at 3:45 PM Stephen Neuendorffer via llvm-dev

Hello all, I was wondering if there is a function in R that only computes the eigenvector corresponding to the largest/smallest eigenvalue of an arbitrary real matrix. Thanks Minh -- Living on Earth may be expensive, but it includes an annual free trip around the Sun.

Dear R-helpers, could anybody explain me briefly what is the difference between eigenvectors returned by 'eigen' and 'svd' functions and how they are related? Thanks in advance Ondrej Mikula

Samba newbie here..... Samba support multiple CPU boxes? Solaris8 specifically. thanks _____________________________________________________ ___________ Sent via the EV1 webmail system at mail.ev1.net

ioemu: fix SDL mouse events processing - GetRelativeMouseState always returns the last position, so when the polling loop gets several mouse events in one go, we would send useless ''no move'' events. - So as to make sure we don''t miss any mouse click / double click, we should not use GetRelativeMouseState() to get the button state, but keep records of the button

Full_Name: Hao Yu Version: 1.4.1 OS: Windws and Linux Submission from: (NULL) (129.100.45.161) Hi, Recently we did some benchmarks regarding matrix inverse operation and found some strange things. See the following results (the package Matrix is most updated). 1. load the function Toeplitz and library(Matrix) "Toeplitz" function(x) { matrix(x[1 + abs(outer(seq(along = x),

Howdy... I have searched the archives, and even read what has been posted on the site regarding a Win32 port of rsync. Though I have found a problem with everything. The URLs for building your own, or downloading the compiled binaries for the Win32 platform are no longer valid. Therein the problem lies, as the information is outdated, and still easily available on the site publicly. I

Hi, Whenever i am using the command rsync --write-batch -av --stats `cat $1` -e ssh user@remote machine:/destination/ This is writing rsync_argvs files in the home directory as well as to the destination directory. Can anyone give me any idea as how to prevent the writing of rsync_argvs files in the home directory which is of no use. Regards, Surabhi. > ---------- > From:

https://bugzilla.redhat.com/show_bug.cgi?id=836710 https://bugzilla.redhat.com/show_bug.cgi?id=836913 There are at least two related bugs going on: (1) Linux sync(2) system call doesn't send a write barrier to the disk, so in effect it doesn't force the hard disk to flush its cache. libguestfs used sync(2) to force changes to disk. We didn't expect that qemu was caching anything