similar to: Matrix manipulation

Dear all, Has anybody tried numerical solving of ODE's and/or transport equations in R? (Don't ask how we ended up in using R for this job, in the first place!) More precisely, does anybody know any technical issue that could make the work insecure in the sense of propagation of errors? Is there any track of evidence that R is, in this kind of task, less reliable than e.g. MatLab?

Hi, Does anybody know, what is going on here? > diag(sqrt(1)) [,1] [1,] 1 > diag(sqrt(0.3333)) <0 x 0 matrix> > sqrt(1) [1] 1 > sqrt(0.3333) [1] 0.5773214 BR, Markku Karhunen researcher University of Helsinki

Hi all, I've been wondering for a long time why R drops the dimensions of an array/matrix when you try to take a subset of one column. I mean this: dim(A) [1] 2 5 2 B=A[1,,] dim(B) 5 2 # so now dim(B)[3] doesn't work C=B[2,] dim(C) NULL # so now nrow(C) doesn't work Typically, you can get rid of this by writing as.matrix, as.array(...) but that generates extra lines of code.

Hi, How do you get the most common row from a matrix? If I have a matrix like this array(1:3,dim=c(4,5)) [,1] [,2] [,3] [,4] [,5] [1,] 1 2 3 1 2 [2,] 2 3 1 2 3 [3,] 3 1 2 3 1 [4,] 1 2 3 1 2 in which rows 1 and 4 are similar, I want to find that vector c (1,2,3,1,2). Atte Tenkanen University of Turku, Finland

Is there some way to change the line widths of plot borders? I couldn't find any parameters for that purpose. Atte Tenkanen University of Turku, Finland

Is there some (much) more efficient way to do this? VECTOR=c(3,2,4,5,5,3,3,5,1,6,6); NEWVECTOR=VECTOR[1]; for(i in 1:(length(VECTOR)-1)) { if((identical(VECTOR[i], VECTOR[i+1]))==FALSE){ NEWVECTOR=c(NEWVECTOR,VECTOR[i+1])} } > VECTOR [1] 3 2 4 5 5 3 3 5 1 6 6 > NEWVECTOR [1] 3 2 4 5 3 5 1 6 _______________________________ Atte Tenkanen University of Turku, Finland

Dear All, I luckily found the following feature (or problem) when tried to apply ifelse-function to an ordered data. > test <- c(TRUE, TRUE, TRUE, FALSE, FALSE, FALSE, FALSE) > ifelse(test, 0, 1:4) [1] 0 0 0 4 1 2 3 > It roots into the ifelse-syntax: ans[!test & !nas] <- rep(no, length.out = length(ans))[!test & !nas] Would it be possible to disable this feature in the

I have a vector that has 1,974 elements and each element is one of the following (B, F, N, Y). How do I recreate that vector accept in the place of N put 0 and in the place of B, F or Y put a 1? Thanks, Jacob [[alternative HTML version deleted]]

Dear Group, I am having trouble with using rlm on multivariate data sets. When I call rlm I get Error in lm.wfit(x, y, w, method = "qr") : incompatible dimensions lm on the same data sets seem to work well (see code example). Am I doing something wrong? I have already browsed through the forums and google but could not find any related discussions. I use Windows XP and R

Moi! A student here has been getting a bit irritated with some side effects of scale() (OS is Windows XP, the behaviour occurs in R 2.0.0, but not 1.7.1). The problem is that she scales a variable in a data frame, then does a regression, and tries to get some predictions for some new data. However, at this point she gets an error (see the example below). This seems to be because the

Hello Group, I could use an advice on how SEXP handles work. My aim is to implement a system where I initially set a few global variables that are used for communication between C and R code. Then I do some work with R code and periodically call a function of my own that will update the system state. Such a design is useful for many purposes (for GUIs to name one). I am not entirely sure that R

On Thu, 06 Jun, at 01:11:53AM, poma wrote: > > Standalone directive 'kbdmap <kbd>.ktl' doesn't work within series 5. > Tested via 5.00, 5.01 and 5.10. > It works within series 4 - tested via 4.05 and 4.06. > Is it a bug, or is it a feature? Could you provide me with your .ktl file? -- Matt Fleming, Intel Open Source Technology Center

On Thu, 13 Jun, at 12:40:48PM, poma wrote: > Regarding [1], [2], and [3], I somehow doubt that this is a '*.ktl' i.e. > "Keyboard Table for Lilo" problem. > Which ones of these[4] produced by the 'keytab-lilo' you need? > All of them[4] were tested. ;) Any one will do. I just want to reproduce this bug. -- Matt Fleming, Intel Open Source Technology Center

R-help, I have a data frame which contains a character string column that is something like; II11 II18 II23 III1 III13 III16 III19 III2 III7 IV10 IV11 IV12 IX16 IX4 V12 V18 V2 V20 V23 V4 VII14 VII18 VII21 VII26 VII28 VII33 VII4 VII48 VII5 .... .... .... I want to apply a function (e.g mean) by grouping according to the roman part of the string, i.e, by I by V by VII ... ... and so on. I have

Hi all ! I have a little problem here mounting or browsing samba shares. I have a FreeBSD 4.6.2 running samba, and a share on that called public. when I try to mount that share it asks for password, and then gives an error: ex. libra# mount_smbfs //maxi@samba/public /mnt Password: mount_smbfs: can't get handle to requester (no /dev/nsmb* device) libra# I can list the shares with

Hello, I am beginner in R and I would like to solve the following problem: Suppose that we have three files to be red in R d1, d2, and d3 > d1 id x1 x2 1 1 4 n 2 2 3 h 3 3 0 f > d2 id x1 x2 1 1 2 r 2 2 3 u 3 3 1 f > d3 id x1 x2 1 1 2 a 2 2 1 w Is there any library or function that one can read this datasets like for(i in 1:3) d[i] <-

Hello All, I have had considerable bad luck with attempting the following with for loops. Here is the problem: # Suppose we have a data.frame with the following data, which can be considered a type of edgelist (for those with networks backgrounds): # # V1 V2 # 1 A # 1 A # 1 B # 2 A # 3 C # 3 A # 3 C # 3 B # # I want the output of the function to produce a matrix, such that #each factor of

> On 27.12.2015 23:57, Jernej Simon?i? via Syslinux wrote: > > On Sunday, December 27, 2015, 23:34:11, Ady via Syslinux wrote: > > > >> How this change would affect users with older versions of kbd / > >> loadkeys / or in older OSes? I mean, let's assume a user using a newer > >> version of Syslinux (containing this proposed change in its keytab-lilo

Hello, Long story short, example config: ### cut UI vesamenu.c32 MENU TITLE Multiboot USB MENU BACKGROUND #00000000 MENU COLOR sel 7;37;40 #e0ffffff #20ffffff all MENU COLOR unsel 37;44 #50ffffff #a0000000 std MENU COLOR tabmsg 31;40 #30ffffff #00000000 std MENU BEGIN MENU TITLE System Rescue CD 2.4.1 INCLUDE sysrcd-2.4.1.conf MENU END MENU BEGIN MENU TITLE

On 29.12.2015 22:51, poma wrote: > On 29.12.2015 22:20, Ady via Syslinux wrote: >> >>> On 27.12.2015 23:57, Jernej Simon?i? via Syslinux wrote: >>>> On Sunday, December 27, 2015, 23:34:11, Ady via Syslinux wrote: >>>> >>>>> How this change would affect users with older versions of kbd / >>>>> loadkeys / or in older OSes? I