Re: [R] Matrix multiplication gives different results some of the times (NaN)

2011-09-13 Thread Xavier Fernández i Marín
Ben Bolker vas escriure el dia dt, 13 set 2011: > You mentioned that you had compiled R yourself. > Can you replicate this with a stock R binary, i.e. from a > Red Hat or Ubuntu repository? If not, can you give details of > your compilation setup, especially if you are using a specialized > or

Re: [R] Matrix multiplication gives different results some of the times (NaN)

2011-09-13 Thread Ben Bolker
Xavier Fernández i Marín gmail.com> writes: > More elements: In python the same algorithm does not show this strange > behaviour. > Is Python using the same BLAS/LAPACK? __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-h

Re: [R] Matrix multiplication gives different results some of the times (NaN)

2011-09-13 Thread Ben Bolker
Xavier Fernández i Marín gmail.com> writes: > Rolf Turner vas escriure el dia dt, 13 set 2011: > [snip] > > This sort of thing should not/does not/cannot happen under > > ``normal circumstances''. There has to be something wrong > > somewhere in your setup. Either your hardware or your sof

Re: [R] Matrix multiplication gives different results some of the times (NaN)

2011-09-13 Thread Xavier Fernández i Marín
Rolf Turner vas escriure el dia dt, 13 set 2011: > > I tried your example code on my laptop running Ubuntu Linux, > and of course it ran --- just as it should (*has* to!) without any > problem; no errors thrown. > > This sort of thing should not/does not/cannot happen under > ``normal circumstan

Re: [R] Matrix multiplication gives different results some of the times (NaN)

2011-09-13 Thread Rolf Turner
I tried your example code on my laptop running Ubuntu Linux, and of course it ran --- just as it should (*has* to!) without any problem; no errors thrown. This sort of thing should not/does not/cannot happen under ``normal circumstances''. There has to be something wrong somewhere in your setup

Re: [R] Matrix multiplication gives different results some of the times (NaN)

2011-09-13 Thread Xavier Fernández i Marín
Joshua Wiley vas escriure el dia dt, 13 set 2011: > I cannot replicate this on, even with 1 milllion reps on: > > R version 2.13.1 (2011-07-08) > Platform: i386-pc-mingw32/i386 (32-bit) > > or > > R Under development (unstable) (2011-08-13 r56733) > Platform: x86_64-pc-mingw32/x64 (64-bit) > >

Re: [R] Matrix multiplication gives different results some of the times (NaN)

2011-09-13 Thread Joshua Wiley
I cannot replicate this on, even with 1 milllion reps on: R version 2.13.1 (2011-07-08) Platform: i386-pc-mingw32/i386 (32-bit) or R Under development (unstable) (2011-08-13 r56733) Platform: x86_64-pc-mingw32/x64 (64-bit) Perhaps it is OS dependent (I am away from my linux box at the moment)?

[R] Matrix multiplication gives different results some of the times (NaN)

2011-09-13 Thread Xavier Fernández i Marín
Dear all, When trying to multiply the same matrices repeatedly I get different results some of the times. It is not systematic, which is the fact that is giving me more trouble to try to isolate the problem. Basically I am doing X %*% B, where X is a Nx2 matrix and B is a vector with 2 values. I