similar to: eigen()

On two laptops running 32-bit kubuntu, I have found that svd(), invoked within R 2.9.1 as supplied with the current ubuntu package, returns very incorrect results when presented with complex-valued input. One of the laptops is a Dell D620, the other a MacBook Pro. I've also verified the problem on a 32-bit desktop. On these same systems, R compiled from source provides apparently

If I have matrics as follows: > a <- c(1,1,0,0) > b <- c(4,4,0,0) > c <- c(3,5,5,6) How can I use R code to solve the equation ax^2+bx+c=0. thanks! yuying shi [[alternative HTML version deleted]]

Hi, I've been trying to convert numbers from an online temperature database into dates and time that R recognizes. I've tried as.Date, as.POSIXlt and strptime the problem is that the database has put a T between the numbers and R will not accept any conversions. currently it sees the date as a factor with the format as 1981-01-02T08:00I would like to keep only the year and month, but my

Hi, > 1e10+5i [1] 1e+10+0e+00i > Im(1e10+5i) [1] 5 maybe little better... --- R-3.5.1.orig/src/main/complex.c 2018-03-26 07:02:25.000000000 +0900 +++ R-3.5.1/src/main/complex.c 2018-07-10 12:50:42.523874767 +0900 @@ -381,6 +381,7 @@ r->i = fround(pow10 * x->i, digits)/pow10; } else { digits = (double)(dig); + if(digits < 1) digits=1; /* a little better */

Full_Name: Pierre Legendre Version: 2.1.1 OS: Mac OSX 10.4.3 Submission from: (NULL) (132.204.120.81) I am reporting the mis-behaviour of the function 'eigen' in 'base', for the following input matrix: A <- matrix(c(2,3,4,-1,3,1,1,-2,0),3,3) eigen(A) I obtain the following results, which are incorrect for eigenvalues and eigenvectors 2 and 3 (incorrect imaginary portions):

Dear R Development Team, I have encountered the following difficulty in using the function polyroot under either NT4.0 (R version 1.2.1) or linux (R version 0.90.1). In the provided example, the non-zero root of c(0,0,0,1) depends on the results of the previous call of polyroot. R : Copyright 2001, The R Development Core Team Version 1.2.1 (2001-01-15) R is free software and comes with

[I thought I'd submitted this bug report some time ago, but it's never showed up on the bug tracking system, so I'm submitting again.] qr.solve() gives incorrect results when dealing with complex matrices or with qr objects that have been computed with LAPACK=TRUE, whenever the b argument has more than one column. This bug flows from qr.coef(), which has a similar problem. I believe

Should both parts of a complex number be printed to the same precision? The imaginary part of 0 looks a bit odd when log10(real/imag) >=~ getOption("digits"), but I'm not sure it is awful. Some people might expect the same number of significant digits in the two parts. > 1e7+4i [1] 10000000+0i > 1e7+5i [1] 10000000+0i > 1e10 + 1000i [1] 1e+10+0e+00i >

Hi, The bug originated when one of our tests failed with an answer-mismatch on Mac, after upgrading to XCode 6.2. The internal IR after all our transforms, and just before it hits the final LLVM lowering is identical on Mac and Linux: var t6 : int8_T{col}[10] = {34, -48, 18, -12, 33, 0, 21, -7, -20, -31}; The LLVM lowering itself doesn't try to do anything smart. When we dumpModule, we

Hi, When R generates density plots and these are exported to postscript( a=matrix(1:100,10,10);image(a,col=rainbow(100);dev.copy2eps(file="image.eps") ) The result often looks bad when rendered on screen. The help page states that this is because programs use anti-aliasing. That seems to be true - turning off anti-aliasing for gs (-dGraphicsAlphaBits=1) of in OSX's preview makes

Good day, LLVMers! We are starting on our third (and hopefully last) round of testing for LLVM 3.0. Please visit: http://llvm.org/pre-releases/3.0/rc3/ for the sources. There are also binaries for Darwin up there, with more to come during the week. Please build this release candidate, test it out on your projects, and let us know if you find any regressions from the 2.9 release. Please keep

On 7 November 2011 22:00, Bill Wendling <wendling at apple.com> wrote: > We are starting on our third (and hopefully last) round of testing for LLVM 3.0. Please visit: > >        http://llvm.org/pre-releases/3.0/rc3/ > > for the sources. There are also binaries for Darwin up there, with more to come during the week. Please build this release candidate, test it out on your

-----BEGIN PGP SIGNED MESSAGE----- Hi, a security hole has been found in the auxiliary fax scripts "faxq" and "faxrunq" in the mgetty+sendfax package. It has been in there since the first day those scripts were written. Due to improper quoting in these shell scripts, it''s possible to execute code with a foreign user id, and get root access to the machine. The

I'm having a problem with a samba ADS member which is a print server (with cups). I am also using winbind. Everything works correctly except that (suddenly, as of a few days ago) newly created printers display the "Unable to display security information" on the security tab of the printer properties. This happened suddenly with no changes made to the samba server. Only samba

Hi All. I have created two, 3-D, color graphs using persp(). Z values range from 1 to 100 on the first plot, and 0.5 to 50 on the second plot. I would like to keep the color range constant between the two graphs, rather than each graph showing the full range of colors. So the first graph should go from yellow to red and the second graph should go from yellow to orange. Below I present a

I can't figure out how to get the x-axis to contain the category lables for my frequency polygon. I'm also not sure if there is a more elegant approach. Any insights on the labels? I tried this: #generate some pseudo data x=c(sort(sample(1:1500,5)),sort(sample(1:1500,3),dec=T)) # assign names to the vector

Hi, I'm responding to a post about finding roots of a cubic or quartic equation non-iteratively. One obviously could create functions using the explicit algebraic solutions. One post on the subject noted that the square-roots in those solutions also require iteration, and one post claimed iterative solutions are more accurate than the explicit solutions. This post, however, is about

On Nov 8, 2011, at 7:18 AM, Jay Foad wrote: > On 7 November 2011 22:00, Bill Wendling <wendling at apple.com> wrote: >> We are starting on our third (and hopefully last) round of testing for LLVM 3.0. Please visit: >> >> http://llvm.org/pre-releases/3.0/rc3/ >> >> for the sources. There are also binaries for Darwin up there, with more to come during

A problem here getting winbind traffic to be encrypted using Kerberos. I have set up a test environment with a pair of servers (actually lxc containers): - samba server (ubuntu 16.04, stock samba 4.3.11) - client machine (ubuntu 16.04) joined with "net ads join" and winbind The client machine has the following in /etc/samba/smb.conf: ------- [global] #netbios name = client-ad