[R] playing with R: make a animated GIF file...

free and crossplatform imagemagick (www.imagemagick.org). under linux and once imagemagick is installed, the command $ convert -delay 10 ani_*.jpg animation.gif makes a looping animated gif `animation.gif' with 10/100 sec. between frame flips. Katharine Mullen Department of Physics

[R] eliminate t() and %*% using crossprod() and solve(A,b)

you might want to see Douglas Bates. Least squares calculations in R. R News, 4(1):17-20, June 2004. http://CRAN.R-project.org/doc/Rnews/ he gives some rules of thumb, eg use solve(A,b) not solve(A) %*% b use crossprod(X) not t(X) %*% X use crossprod(X,y) not t(X) y Katharine Mullen

Re: [R] Write a summary or a longer text to a graphical device

__ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Katharine Mullen Department of Physics and Astronomy Faculty of Sciences Vrije Universiteit Amsterdam

Re: [R] Using R to process spectroscopic data

the SVD of your measurements and plot the singular values. The number of values that stand out may be used as an estimate of the number of components. Feel free to contact me for more information. We look forward to providing a complete and powerful package soon! Katharine Mullen Department

Re: [R] click on graph and select data points?

if you are interested in a solution using the tcltk package, then an idea is to base a solution on the code for the demo tkcanvas. after installing the tcltk package, then require(tcltk) demo(tkcanvas) Katharine Mullen Department of Physics and Astronomy Faculty of Sciences Vrije

Re: [R] tcltk package problems (R 2.2.0, SuSE 10)

recompiling gcc to include gfortran from the source (at e.g. http://gcc.fyxm.net/releases/gcc-4.0.2/ ) if you want some more detailed instructions feel free to mail me. best regards and good luck. Katharine Mullen Department of Physics and Astronomy Faculty of Sciences Vrije Universiteit de

Re: [R] Estimate Fisher Information by Hessian from OPTIM

ChenYen wrote: Dear All, I am trying to find MLE by using OPTIM function. Difficult in differentiating some parameter in my objective function, I would like to use the returned hessian matrix to yield an estimate of Fisher's Information matrix. My question: Since the hessian is calculated

Re: [R] Matlab's lsqnonlin

. Katharine Mullen mail: Department of Physics and Astronomy, Faculty of Sciences Vrije Universiteit Amsterdam, de Boelelaan 1081 1081 HV Amsterdam, The Netherlands room: T.1.06 tel: +31 205987870 fax: +31 205987992 e-mail: [EMAIL PROTECTED] homepage: http://www.nat.vu.nl/~kate/ On Fri, 7 Sep

Re: [R] Matlab's lsqnonlin

other methods do falsely claim convergence! Martin Maechler, ETH Zurich KateM KateM Katharine Mullen KateM mail: Department of Physics and Astronomy, Faculty of Sciences KateM Vrije Universiteit Amsterdam, de Boelelaan 1081 KateM 1081 HV Amsterdam, The Netherlands