similar to: Position of a specific letter in a character string

Help! I accidentally saved my work as an .rdata format instead of .txt I need to somehow get it saved as a .txt file otherwise i'm really in trouble! Does anyone know how to convert .rdata to .txt files?? I also tried re-loading the file into R to see if i can re-save it but it doesnt work! i've attached it below... please help me asap! i need to turn it in as a .txt file Thanks

Hi all - I'm trying to find a way to create dummy variables from factors in a regression. I have been using biglm along the lines of ff <- log(Price) ~ factor(Colour):factor(Store) + factor(DummyVar):factor(Colour):factor(Store) lm1 <- biglm(ff, data=my.dataset) but because there are lots of colours (>100) and lots of stores (>250), I run it to memory problems. Now, not every

Hi All - I recently moved to Vista and reinstalled R. I am able to run R as I typically do (R.exe from the command prompt), and it can work well. However, if I switch windows to, say, firefox or excel or anything else, when I return to the R prompt it no longer works. I am able to use the up and down arrow keys to access previous commands, but no other key stroke has any impact. As long as I

(Apologies the previous version was sent as rich text) Hello, I'm new to R, but I've read the intro to R and successfully connected it to an instance of mysql. I'm trying to perform multiple linear regression, but I'm having trouble using the lm function. To start, I have read in a simply y matrix of values(dependent variable) and x matrix of independent variables. It says both

Hi everyone, suppose I have a 2D matrix, is there a command to snip out a specific row/column and then remerge the remaining columns/rows back into a contiguous matrix? I will need to repeat this operation quite a bit(reverse selection). Thanks for any insights you can offer. Yifei

Hi all. A question for knowledgeable folks using R on an Intel Mac running OS X 10.4.10 For ease of maintenance, I have broken a large R script into a main script which ?oversees? things by calling other scripts, using ?source?. Let?s call the secondary scripts ?sub-scripts.? I?d like for the sub-scripts to reside in a different directory (again, for ease of maintenance, and so I can access

Hi R-Experts, I'm having a problem with reading a large data file which is in .csv format and size is 120 MB (app.). I was trying to use RODBC package but I found RODBCconnectExcel function only. And can I convert this file to .dbf format? How can I read this file? And also let me know if this was a file in .sas7bdat format, what should I do? Thanks in advance.

Hi all, My apologies for a very simple question. I just downloaded R 2.6.0. I want to bring in all of the objects from 2.5.0 that I see when I type ls(). I have no idea how to do that. Thanks in advance. David -- ======================================================================= David Kaplan, Ph.D. Professor Department of Educational Psychology University of Wisconsin - Madison

Hi All Maybe I dont understand it, but I would have expected that the design matrix has as many rows as there were observations available to fit the model. Below a small artificial dataset created, then one model fitted and the design matrix outputted, having 27 rows. Then I delete 6 obs, and fit the model on these 21 obs, but the design matrix that comes out has 26 rows? Thanks for your

Hi all. i am desperating. i need a matrix of p.values from an chi square test. i had it already work but than my computer collapsed when taking the whole data set 800x260 into account. i am sure it looked like this but it doesn't work now. can anybody help me? thanks in advance. x=read.table("C:\...) d=ncols(x) z<=matrix(0,d,d) for(i in 1:d) for(j in 1:d)

Dear all-- I am still forging my first arms with R and I am fighting with regexpr() as well as portability between unix and windoz. I need to extract barcodes from filenames (which are located between a double and single underscore) as well as the directory where the filename is residing. Here is the solution I came to: aFileName <-

Hi all, This question involves using a "for" loop to make a "decision" in a script. I've written a rather intricate script, and near the start of it, I want it either to do a loop (if a variable called "number.runs" > 1) or not do a loop (if "number.runs" is 1). This is probably trivial but I can't figure it out. Here's a self-contained

Hello, Sorry if anyone gets this message twice, as my mailserver may not be working. Thanks for your response. Your idea makes a lot of sense to me, but I've been unable to get seconds to work. I ended up with this format finally: "2007-10-31_16:20:22" Problem is I am unable to get it recognized as a date using timeDate(): R>

Hi, I am planning on putting some R script in an appendix of a LaTex document. Can anyone recommend me a way of how to format it? Is there a way to keep all line breaks without having to insert \\ in every single line? Thank you! Benjamin

This is a very simple question, so I apologize I couldn't find it online: I want to shorten the string 'apples.pears' to 'apples'. string='apples.pears' string1=substr(string,0,x) For x above, I would like to have a command like charAt(string,"."), i.e. the position of the period in the word, but I can't seem to find a charAt command in R. Thank you.

I am fairly new to R and I am writing a script that would take a file, as an input, and generates a bunch of graphs out of it. My first task is to be sure that the file is of the right type by looking if there is a valid barcode in it as in (the barcode is beetween a double and single underscore): library(tkWidgets) ############## #Loading a file #testing if valid if not kill the execution

I am currently being defeated by grep. I am attempting to determine the value of the last letter of a character string. An example of my data set is shown below. Regarding the codes, I would like to identify the value of the last character and then take the appropriate action, e.g. If the value is L then label UL rating XXX It the value is F then label UL rating YYY ... I assume it will be

Hi - I'm trying to use R to create an MS Access query object. In particular, I would like to pass a given sql statement to a variety of Access files and have that sql statement saved as an Access Query in each db. Is this possible using R? I'm aware that I could use RODBC sqlQuery and write sql to make a table or that I could run the sql, extract it to R, and then use sqlSave to save the

Greetings Listers! the R-squared value reported by summary of lm is calculated as 1 - RSS/RSS_m where RSS_m is the residual sum of squares of a minimal model. In most cases, the minimal model is simply y = mean(y), but when a constant is left out of the model, the minimal model is y = 0. However, if you manually add a constant, R still considers y = 0 the minimal model. This also causes

Hi everyone - This came up within the last day -- Jim's response to Deepankar is pasted below. There are probably lots of reasons, but what is the advantage to using .temp over, say, temp? I often find myself writing temporary objects -- should I use the . preface? What would be the advantages to doing so? Thanks in advance for what will surely be a collection of illuminating responses.