[R] image usage

I am beginner in R and am trying to use the image function to create a grid, but would like to use an outer file as input. A file that contains the following array for example: 3 4 5 2 3 5 1 2 1 so that each cell has a color with different intensity. I am

Re: [R] Simplex Out of Bounds Error

On Sat, 11 Oct 2003 [EMAIL PROTECTED] wrote: I am running the following code (testing the use of the simplex function to determine if a point is in the convex hull of another set of points or not): a - c(0, 0) A3 -matrix(c(1,2,3,4,1,1), ncol = 2, byrow = T) b3 -c(1.5, 3.5, 1) simplex(a =

Re: [R] image usage

Suppose your data is in image.txt, space delimited (one or more spaces), then you could use: myimage - as.matrix(read.table('image.txt',skip=0,header=FALSE,sep=,strip.white=TRUE))to view the resulting image use: image(myimage) to get contours: contour(myimage) etc. --

Re: [R] DBI Interface broken

Fernando Henrique Ferraz wrote: Hi, I'm trying to use R's DBI interface but it appears to be broken. I am using R 1.8.0 on Linux, and have just installed DBI 0.1-6 through the command 'install.packages(DBI)'. Installation went fine, but now when I try to do a simple

Re: [R] Automatic re-looping after error

On 09-Oct-03 Thomas Lumley wrote: On Thu, 9 Oct 2003 [EMAIL PROTECTED] wrote: All that's really needed to cope with the situation is for R to drop that cycle of the loop, and resume with a new cycle. However, I'm wondering how to set this up. I've had a look at try(), and I'm not at all

[R] Some teaching/training materials (ESS/ESS-Noweb-Sweave/SNOW)

http://www.analytics.washington.edu/~rossini/courses/cph-statcomp/ Lecture/Labs 1 and 2 are on For ESS, ESS-Noweb-Sweave. Lecture/Lab 4 is on parallel computing with R (each Lecture/Lab was just under 2 hours). Comments/corrections welcome, they were used last week here in Copenhagen, so

[R] Some R-related teaching/training materials (ESS/ESS-Noweb-Sweave/SNOW)

http://www.analytics.washington.edu/~rossini/courses/cph-statcomp/ Lecture/Labs 1 and 2 are on For ESS, ESS-Noweb-Sweave. Lecture/Lab 4 is on parallel computing with R (each Lecture/Lab was just under 2 hours). Comments/corrections welcome, they were used last week here in Copenhagen, so

Re: [R] interpolation methods

Dear, Have a look at: *akima http://cran.r-project.org/src/contrib/akima_0.3-4.tar.gz: Interpolation of irregularly spaced data* Linear or cubic spline interpolation for irregular gridded data Kris --

[R] boot statictic fn for dual estimation of 2 stats?

Hi, I am trying to use boot() to refit an ordinal logit (polr in MASS) model. (A very basic bootstrap which samples from the data frame without replacement and updates the model.) I need to extract two statistics per run (the coefficients and zeta) and I tried concatenating them into a

Re: [R] boot statictic fn for dual estimation of 2 stats?

Occasionaly, the polr returns a zeta element of length equal to 2 rather than 3 (which I guess is what you're expecting). You're bootfn function should always check to see that it's returning an object of the same length every time. -roger Olivia Lau wrote: Hi, I am trying to use boot() to

[R] multiple character matching within a string

Hello all, I need to count the number of times certain characters occur in a string. The only way I have found so far to accomplish this is by using strsplit i.e. my.string - DDDRRHIH my.char - D num.char - -1 + length(unlist(strsplit(my.string,my.char))) now you probably won't be surprised

[R] evaluating R expressions from C

Hello! I've looked at R help and previous postings, but I am not sure I completely understand the mechanism of evaluating R expressions from C++. They have function SEXP eval(SEXP expr, SEXP rho), but I can't get it to work. Could anyone who used it give any comments on how efficient it is