[R] Suppressing the Intercept in lm() when using a dataframe for the model

It's easy to run a linear regression on a simple model without an intercept just by doing this: lm(y ~ x1 + x2 -1) Is there a similar trick to suppress the intercept when your model is in a large dataframe and you don't want to write out the names of individual columns? -- View this message in

Re: [R] Suppressing the Intercept in lm() when using a dataframe for the model

Well don't I feel silly now. Thanks for the help! -- View this message in context: http://r.789695.n4.nabble.com/Suppressing-the-Intercept-in-lm-when-using-a-dataframe-for-the-model-tp3910327p3910443.html Sent from the R help mailing list archive at Nabble.com.

[R] Writing dataframes side by side in a file

Is there a quick and easy way to write data frames side-by-side in a csv file with one column separating them? I could just fill them with empty rows so they all have the same height, then cbind them with empty columns in between, but I'm looking for a more elegant solution, if one exists.

[R] What does the - operator mean?

I've been reading some code from an example in a blog post ( http://www.maxdama.com/ here ) and I came across an operator that I hadn't seen before. The author used a - operator to update a variable, like so: ecov_xy - ecov_xy+decay*(x[t]*y[t]-ecov_xy) At first I thought it was a mistake and

Re: [R] What does the - operator mean?

I should probably point out that in the example, ecov_xy and decay are scalars, and x and y are vectors. -- View this message in context: http://r.789695.n4.nabble.com/What-does-the-operator-mean-tp3466657p3466672.html Sent from the R help mailing list archive at Nabble.com.

Re: [R] Rearranging columns with cbind

It's just a typo. You're missing a comma at the beginning of your index, and you should list all of the rows in a vector, like this: data[, c(19:27, 1:12, 13:15, 16:18)] The way you entered it, R is looking for rows 19:27, columns 1:12, and doesn't know what to do with the other numbers. --

[R] Creating a dataframe from a vector of character strings

I have a vector of character strings that I would like to split in two, and place in columns of a dataframe. So for example, I start with this: beatles - c(John Lennon, Paul McCartney, George Harrison, Ringo Starr) and I want to end up with a data frame that looks like this: Beatles =

Re: [R] Looking up the directory a file is located in

So it sounds like the best we can do in R is to keep track of the script in a sort of master file that runs the script, and set the working directory in the master. Is that accurate? In Python any time you run a script, there is a built-in __file__ variable that can tell you the file name of

Re: [R] Looking up the directory a file is located in

Thanks, Gabor! So far I like this one best: https://stat.ethz.ch/pipermail/r-help/2005-November/082347.html So if my script is called myRscript.r, I can do the following: this.file = parent.frame(2)$ofile this.dir = gsub(/myRscript.r, , this.file) setwd(this.dir) This will set the working

Re: [R] Looking up the directory a file is located in

The dirname() function looks very helpful; I hadn't heard of that one before. I'm still reading up to see how the parent.frame command does what it does; I didn't realize that the ofile variable might not be around in the future. Richard's suggestion -- source(c:/myfullpath/myfile.r,

[R] Looking up the directory a file is located in

Hello everyone, This should be an easy question, I think. I'd like to write a command in a program to set the working directory to whatever directory the file is currently stored in. Suppose I have a file called myRscript.r, and it's stored in C:\Rprojects\myRscript.r, and it references other

Re: [R] Looking up the directory a file is located in

Basically I'm just looking for a command that can look up the name of the directory of the script that is running. If I move or copy the script to another directory, it should be able to read the name of the new directory without me having to edit the code. Once I have identified the directory,

[R] Prime Factorization

Hi everyone, I have a very quick question: Is there a ready-made function in R or any R packages to find the prime factorization of an integer? -- View this message in context: http://r.789695.n4.nabble.com/Prime-Factorization-tp2548877p2548877.html Sent from the R help mailing list archive at

[R] write.csv() : attempt to set 'append' ignored... Why?

I'm running R 2.11.0 on a 32-bit Windows XP machine. Whenever I try to write a csv file with 'append' set to TRUE, I get this message: attempt to set 'append' ignored. Obviously, this is no good, since R is deleting my previously saved data files, rather than appending to them. What can I do

Re: [R] Accessing files on password-protected FTP sites

Thanks for the tip. From the link you posted: | You can embed the user id and password into the URL. For example: | | http://userid:passw...@www.anywhere.com/ | ftp://userid:passw...@ftp.anywhere.com/ I'm still having issues, though. I am trying to fetch some csv files from a storage site

[R] Accessing files on password-protected FTP sites

Hello everyone, Is it possible to download data from password-protected ftp sites? I saw another thread with instructions for uploading files using RCurl, but I could not find information for downloading them in the RCurl documentation. I am using R 2.11 on a Windows XP 32-bit machine. Thanks

Re: [R] executable script

In Python, it is literally this easy: import rpy2.robjects as robjects robjects.r( source(C:/YOUR R FILE GOES HERE ) ) Type the name of your R source code into this script and save it as a Python script (add the suffix .py), and then you can run by double-clicking. If you

Re: [R] executable script

True, but all he said was that he wanted to auto-launch his program by double-clicking it. I don't know of any ways to speed up R other than to write the slower functions in C and then call them in your R programs. But I'm not sure that's what he had in mind. On Mon, Jun 14, 2010 at 9:19 PM,