similar to: Read.Table Reading a Text file

hi, I'd like to extract data from very large files (ca 1-2 Mio lines), and I already know which lines of these files I need. Is there a way to do it without filling the memory with the whole file content? The lines I need are randomly distributed within the files. Thanks, Marc -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at

Dear R- User I created two random number sets using rnorm function and calcuted their respective means. However now I would like to randomly replace some values with NA. Thus create my own test data. Any help or suggestions on this ? Also wanted to confirm when multiplying two random number vectors x am y by matrix..is this how i do it. A is the matrix z <- c(x,y)

Dear R- users and Helpers I am a beginner for R. I am using R to implement EM algorithm for treating Missing values. I would like to know how can save or compile my logical R commands to an application; so that the next time I could just execute the R- file. Example for calculating the mean of a data set x <- c(8,11,16,18,6,4,20,25,9,13) u <- mean(x) u Now I would like to save

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Dear R - users/Helpers I am dealing with bivariate Normal data with missing values. Further I am trying to implement Expectation-Maximization (EM) algorithm to resolve the missing data problem. Now one of the requirements is use the Log likehood function i.e -2Log so as to find a reliable convergence.... My question is there any R built function for the same or do i have to use the

Hi all, i have a little problem, and i think it is really simple to solve, but i dont know exactly how to. here is the "challange": i have a data.frame with n colum, i have to group 2 of them and calculate the mean value of the 3. one. so far so good, that was easy - i used aggregate function to do this: group<-aggregate(x[,1],list(x[,2],x[,3]),mean) and now i have to copy the

Dear R- helpers Following a draft structure of the R script for which I am facing problem Step 1 x <- of type array with original values y <- of type array with original values Step 2 for (ctr in 1:10) { # my problem here the both x and y still show the original values from step 1 # in spite of making changes to the old values of the arrays x and y in the function function

Hi, First, let me thank Jaroslaw for making this survey. I find it quite illuminating. Now the questions: * the #1 solution below (based on cumsum) is numerically unstable. Specifically if you do the runmean on a positive vector you can easily get negative numbers due to rounding errors. Does anyone see a modification which is free of this deficiency? * is it possible to optimize the

Anyone know what's up w/ tolstoi.newcast.edu.au (home of the threaded R-help archives)? I've got a "can't connect" for several days now. Carl

Just out of curiosity, what is the difference between the terms for package and library ? Why are we loading a package with the library() command ? If this is a case of RTFM, I would be happy to do so if pointed in the right direction. I have searched the FAQ and mail archives and only came up with http://tolstoy.newcastle.edu.au/R/help/05/02/12162.html but this still does not explain what is

Hi list,I apologize if you see funny fonts, b/c I'm using the new Windows Live Hotmail and don't know how to turn off the "rich text" mode.....I have successfully built and installed a R package in windowsXP for R-2.5.1. But when I tried to create a .zip file so I can use "Packages/install package(s) from local .zip files..." to install it, it seems R only recognizes

Dear R users, I have multi-argument returns in a function and I am warned by the program they are deprecated. I have found this in the R-help archives : http://tolstoy.newcastle.edu.au/R/help/01c/0319.html http://tolstoy.newcastle.edu.au/R/help/01c/0356.html Since I am not too good at programming, the list solution seems the better one for me. It is also the one advocated by Kevin Murphy. So

I am using the RODBC package to read data from an Excel file. An excerpt of the file looks like this: 00103V206 AES Corporation 6.00% 42.87 00808N202 AES Trust III 6.75% 34.98 03748R861 Apartment Investment & Management 9.00% #ERROR (I) 039380209 Arch Coal, Inc. 5.00% 61.51 My problem appears to be related to specification of data types by column. For instance, the CUSIPS in column 1 are

Hello, I have difficulties combining boxes and lines in plot legend. I searched previous R-posts and found this (with no solution): http://tolstoy.newcastle.edu.au/R/help/06/07/30248.html. Is there a way to avoid boxes behind the line legends? x1 <- rnorm(100) x2 <- rnorm(100, 2) hist(x1, main = "", col = "orange",ylab = "density", xlab = "x", freq =

Hi, A previous thread suggests that R on Windows is multi-threaded http://tolstoy.newcastle.edu.au/R/help/03b/6946.html When I'm running R 2.5.1 on a dual core pc I get Rgui.exe uses up to 50% of the available cpu and the rest is not used. i.e. it only uses one cpu. I'm soon going to get a nice shiny new 8 cpu machine which it would be very nice to fully utilize. Is there any way to

r-help: I have an R package suggestion. After spending several hours the other day installing about a dozen packages, I had an idea. In xemacs, there is a "sumo" package which allows me to install a large bundle of xemacs packages at one time (about a 120 modes including ESS). I think R should have a similar bundle. It would be so much easier than hunting/downloading/installing.

Hello all I've been using the hclust and as.dendrogram objects for hierarchical clustering. The problem I have is that my sample set is now so large (circa 500 points) that it isn't possible to view the leaf nodes. I'd like to be able to zoom in on specific areas of the graph by selecting a region with the mouse. I've deduced from trial and error that the xlim and ylim

Hi R-users, Following this post http://tolstoy.newcastle.edu.au/R/help/06/06/28965.html , how do I get last two rows (or six or ten) by id group out of the data frame? Here the example gives just the last row. Sincere thanks, Lauri [[alternative HTML version deleted]]

I am new to this listand am unable to get the search tools listed on https://stat.ethz.ch/mailman/listinfo/r-help towork. What do people use to search the help archives? 1. The google search box on http://tolstoy.newcastle.edu.au/~rking/R/ returns a 404 error. 2. The http://finzi.psych.upenn.edu/ site has many references but I don't see how to search r-help from there. 3. The

Dear all, I already posted a question regarding this to an existing thread: http://tolstoy.newcastle.edu.au/R/e2/devel/06/10/0852.html#start I apologize for the double posting but I have some further information that might be illuminating. I am trying to cross-compile my R-package under ubuntu linux, kernel 2.6.17-10-generic, on an IBM T60. I am following the suggested steps in