similar to: a loop question

Hi, I've been playing with: > joinDate <- format(strptime(as.vector(forum[,2]), "%d-%b-%y"), + "%d-%b-%Y") > today <- format(strptime(as.vector("14-Jun-04"), "%d-%b-%Y"), + "%d-%b-%Y") > joinDate [1] "04-Feb-2004" "13-Feb-2004" "26-Feb-2004"

I've got a PhD student starting this year. She'll be working on data mining. She has asked for a reading list while she's still in her home country, which is a really good sign. Her cosupervisor and I don't (think we) have any problem with choosing things that are specifically about data mining, but there are some statistical ideas (sampling, exploratory-vs-confirmatory,

Hi, Suppose I have a categorical variable called STREET, and I have 30 levels for it (i.e. 30 different streets). I want to find all those streets with only 15 observations or below then collapse them into a level called OTHER. Is there a quick way, other than using a for() loop, to do it? Currently what I'm doing is something like: ### Collapse STREET (those < 15) st <- c()

Hello I would like to install a package on R (splancs package) after downloading them what is the step for implementing them in my library? Thank you. --------------------------------- [[alternative HTML version deleted]]

I can't load the packages locfit, lokern and quantreg. When I try to load the 3 packages the R program says that the pakages are not properly installed. He says to see the note in ?library. I think that the error is because there is no built field in the 3 packages. What can I do to make the packages run. My OS is Windows XP. Thank you Rui Martins

Hello, I am using R for Windows and I receive error messages when trying to change my working directory: > setwd('C:\BACC_R') Error in setwd(dir) : cannot change working directory I would really appreciate your help, Joan Serra

Hi , i'm having trouble getting data from outside and trying to do either a discrimination analysis or a regression analysis.I don't know what kind of data i need to use and also what are the packages i need to use. Please get me some direction so i can begin . __________________________________

I am familiar with the rpart and tree packages for classification and regression trees. However, quite a bit of the research in the transportation community relating to decision trees uses the C4.5 family of algorithms by Quinlan. Are there any plans to make a C4.5 (or a derivative of it) available to R? If not, then I might use the WEKA Java package ( http://www.cs.waikato.ac.nz/ml/weka) that

After I use function plot() to get an image, how can I save the image or export it to .gif or other digital formats? Thanks a lot.

Hi, How could I plot two vectors on the same graph? For example, if I have two lists of results, each list is a vector. I want to display them on the same graph, so I can compare them. How could I do that? Regards, Justin

First . . . SUBSCRIBE (I want to subscribe to the list). Second, I am trying to install R on windows XP. In looking at the instruction manual I get the following: The simplest way is to use 'rw1081.exe' or 'miniR.exe'. Just double-click on the icon and follow the instructions. If you installed R this way you can uninstall it from the Control Panel. How do I get the

Dear all, Is there a camera rotation for 3d graphics in R. I have seen it in a conference one time and thought it is pretty neat. the presenter was able to rotate the 3d graph with dragging the mouse up down left right. If not in R is there something that is open source that does this. Thank you Jean Eid

Hi, I have a problem with R; it won't start! I've installed it fine, no problems, but when I try to run it the mouse cursor changes to an hourglass for 1 second and back to normal, and that's it, it doesn't start up. No error messages or nothing. I run Windows XP Pro. by the way. I'd be thankful for any help. [[alternative HTML version deleted]]

Hello right, I need a good book to help me with R. background, programming in matlab, perl, visualBasics. os windows and Linux. some good books to match the need would be appreciated. Thanks

Sorry, I forgot to correct the message subject, so I am resending my doubt it below: Hi all! I wrote a very basic program in R, which has some loops ('for' and 'while'). Is there a way to print the 'for' (or while) indice while the program is running so that I am able to estimate where the program is and how long it will last? I mean, I want something like this:

Hi there, I know this question may sounds strange, but here it goes: Is it possible to delay the speed of a for loop? For example, if I have: for (i in 1:100) { blah blah blah } within the for loop I want to draw a series of plots, and combining the plots together I'll have an animation. Problem is the loop is too fast and I only see the end result (which is not surprising actually).

Hi Fellows from R-Help List! My questions are basic since i an new with R. I am very acquainted with Matlab & Gauss (the compentence, I guess). Anyhow, (1) I am trying to get R execute comands made or built as text, so that one can feed a particular option with many variations coming from a text file. Is this possible with the free version? For instance, there exists the eval comand in

> the main advantage it has over SPSS-like software is that you do not > need to explicitly create dummy variables. You only need to specify > your dependent variable and independent variables and R will fit it > (and create dummy variables automatically) for you. Does the audience know exactly what the creation of dummy variables in SPSS is and means? If not, they might consider

Hi, I'm a bit confused how julian() works. If I understand right, it returns the number of days since the origin. I have a vector: > SLDATX[1:10] [1] "1986-01-06" "1986-01-17" "1986-02-02" "1986-02-04" [5] "1986-02-04" "1986-02-21" "1986-03-06" "1986-03-25" [9] "1986-04-06"

OK I have been trying to learn how to use this program and I cannot even import any data into it. I have downloaded all the manuals but they do not seem to help. Is there a book on R for dummies???