similar to: sorting without order

Full_Name: Marc Mamin Version: 1.8, 2.0.0 OS: Windows & Linux Submission from: (NULL) (217.17.202.254) Using only the beginning of a column name will match it: >aaa<-1 >df<-as.data.frame(aaa) >names(df) [1] "aaa" >df$a [1] 1 !!!!!!!!! (I expect df$a to be undefind) >df$x >NULL Compare with: > df["aaa"] aaa 1 1 > df["a"]

Hello, I'm looking for a function that counts the occurences of a given character within a string. f('|','ab|c|d') => 2 More precisely, I need to complete a vector of strings to ensure that all elements have the same count of a "separator": a|b|c a |a|b|c|d => a|b|c|| a|||| |a|b|c|d I guess that scan makes use of an internal function that would do

Hello, I'd like to insert a "wait" function in my code. The reason is that I output timestamped files and I want to ensure that at least 1 second separes 2 files to avoid overwriting the previous file. Thanks, Marc Mamin

Hello, I would like to have a function that retrieve matching strings in the same way as with java.util.regex (java 1.4.2). Example: f('^.*(xx?)\\.([0-9]*)$','abcxx.785') => c('xx','785') First of all: Is it possible to achiev this with grep(... perl=TRUE,value=TRUE )? As I would call this function very often with large data, I'm reluctant to use Sjava

Hello, I'm looking for a fast way to retrieve the position of elements from a vector which match element in another vector. Example va<-c('a','e') vb<-c('a','b','c','d','e','f','e') f(va,vb) should return c(1,5,7) I have 2 different cases: I) my vector vb contains only distinct values II) my vector vb may

Dear r-helpers! I have trouble reading data from an Oracle data base using RODBC Version 1.0-3, R Version 1.7.1, Windows XP, Oracle8 ODBC Driver Version 8.1.6.4.0: > library(RODBC) > channel <- odbcConnect(dsn="PAV32", case="oracle", believeNRows=FALSE) > # ok, this was succesful > x <- sqlTables(channel) > x[37, ] TABLE_CAT TABLE_SCHEM TABLE_NAME

Hi, As the server www.omegahat.org seems to be down since quite a while, could someone send me the RSXML library for Windows2000 ? Many thanks, Marc Mamin

Hallo, I'd like to add grid lines to a lattice graph having 2 series of Y data. See these 2 examples: data(iris) [1] xyplot(Sepal.Length + Sepal.Width ~ Petal.Length , data = iris, allow.multiple = TRUE, scales = "same",type="l", ) [2] xyplot(Sepal.Length + Sepal.Width ~ Petal.Length , data = iris, allow.multiple = TRUE, scales =

On Friday 18 July 2003 12:28, r-help-request at stat.math.ethz.ch wrote: > Message: 9 > Date: Thu, 17 Jul 2003 13:50:29 +0200 > From: Marc Mamin <M.Mamin at intershop.de> > Subject: [R] line colors in lattice.xyplot with png device. > To: r-help at stat.math.ethz.ch > > Hi, > > R is very new for me, so excuse if my questions are too basic... > > ????????BTW,

Hi, I have a strange issue under W2K; consider these two code extracts: 1) if(condition a){ trellis.device(png,filename = filename_a,... xyplot(... dev.off() } 2) if(condition a){ trellis.device(png,filename = filename_a,... xyplot(... } dev.off() In 1), The png file is generated, but empty; in 2), where I've taken the dev.off clause out of the condition block, my plot is

Hi, R is very new for me, so excuse if my questions are too basic... BTW, are there any forum where new R users could get help without annoying this huge mailing list ? In following code, I'd like to choose the color for each of the curve diplayed. png(filename = filename, width = 950, height = 600, pointsize = 10, bg = "white") xyplot(HITS+MS1*3+FREQ~TIME

Dear Rdevelopers The background for this email is that I was helping a PhD student to improve the speed of her R code. I suggested to replace calls like t(AA)%*% BB by crossprod(AA,BB) since I expected this to be faster. The surprising result to me was that this change actually made her code slower. > ## Examples : > > AA <- matrix(rnorm(3000*1000),3000,1000) > BB <-

Hi, thanks for this great work. Just a minor point - maybe you should mention the rm -rf $FAKE_ROOT command within your README file: It caught me unexpected and I was looking a couple of minutes for the package artifact before I actually read the last line. Regards, Burkhard Kohl Lead Engineer Content Management burkhard.kohl at intershop.de INTERSHOP? http://www.intershop.de INTERSHOP

Hello, The problem I'm working now requires to operate on big matrices. I've noticed that there are some packages that allows to run some commands in parallel. I've tried snow and NetWorkSpaces, without much success (they are far more slower that the normal functions) My problem is very simple, it doesn't require any communication between parallel tasks; only that it divides

Hi, I have a 5x731 array A, and I want to compute the sums of the columns. Currently I do: apply(A, 2, sum) But it turns out, this is slow: 70% of my CPU time is spent here, even though there are many complicated steps in my computation. Is there a faster way? Thanks, Martin

Hi, Couldn't is.unsorted() bail out immediately here (after comparing the first 2 elements): > x <- 20000000:1 > system.time(is.unsorted(x), gcFirst=TRUE) user system elapsed 0.084 0.040 0.124 > x <- 200000000:1 > system.time(is.unsorted(x), gcFirst=TRUE) user system elapsed 0.772 0.440 1.214 Thanks! H.

Hi, I am experiencing a long delay when using dataframes inside loops and was wordering if this is a bug or not. Example code: > st <- rep(1,100000) > ed <- rep(2,100000) > for(i in 1:length(st)) st[i] <- ed[i] # works fine > df <- data.frame(start=st,end=ed) > for(i in 1:dim(df)[1]) df[i,1] <- df[i,2] #takes for ever R: R 2.0.0 (2004-10-04) OS: Linux, Fedora Core 2

hi all If I wanna get the total number of lines in a big file without reading the file's content into R as matrix or data frame, any methods or functions? thanks in advance. Regards

http://dlc.sun.com/osol/on/downloads/b114/ This URL makes me think that if I just sit down and figure out how to compile OpenSolaris, I can try b114 now^h^h^h eventually ? I am really eager to try out the new quota support.. has someone already tried compiling it perhaps? How complicated is compiling osol compared to, say, NetBSD/FreeBSD, Linux etc ? (IRIX and its quickstarting??) --

Hi all, I'm looking for an efficient solution (speed and memory) for the following problem: Given - a data.frame x containing numbers of type double with nrow(x)>ncol(x) and unique row lables and - a character vector y containing a sorted order labels Now, I'd like to sort the rows of the data.frame x w.r.t. the order of labels in y. example: x <- data.frame(c(1:4),c(5:8))