similar to: Updating selected variables in a data frame

I would appreciate some advice on the following task. I have some data that currently looks like this: t1 <- data.frame(id=c(1,1,2,2), aspect=c("A","B","A","B"), score=c(10,9,11,12)) I'd like it to look like this: id A B 1 10 9 2 11 12 reshape() looks like a good candidate for this job but I'm not really sure about the roles of

Dear users, is anybody of you aware of a R command to perform laplace transform or even its inversion? Thank you very much. Luca

My computer is a pentium 4 running at 2.4 GHz. My R is 1.7.1 I have written a program in R that calls C++. The program spends most of the time in C++ ( > 90% ). R basically deals with output and input. How slower can this be compared with the program I would get from rewriting everything in C++? Thank you.

Dear R experts, format(12345678, digits = 2) gives [1] "1.2e+07" while format(1234567, digits = 2) gives [1] "1234567" but I'd like the last number to be represented as "1.2e+06" string too. Where am I wrong? Thanks, Timur.

Dear list, I have a data frame of survey respondents, a little like this: set.seed(20081215) n <- 100 dat <- data.frame(id=1:100, addr1=sample(LETTERS, n, replace=TRUE), addr2=sample(LETTERS, n, replace=TRUE), addr3=sample(LETTERS, n, replace=TRUE)) head(dat) id addr1 addr2 addr3 1 1 R H Q 2 2 H C K 3 3

Hello R users, I'm using xyplot (lattice) to plot some data. Unfortunately, the text that goes into each strip is often too big to fit. For instance, one of the factors may be labelled "Satisfaction with waiting time" which is too wide to fit. If I use split.string() to wrap it onto two lines it is then too high to fit in the strip. I'd prefer to apply split.string on the

Dear R users, Sorry if this has been discussed before. I was recently looking at the MySQL site and saw that they offer various levels of paid support. The support options range from basic email support (USD200) through to extensive telephone support from the development team (USD10000). These are annual prices. This is something I would be happy to see available with R (maybe it is?). My

Dear R users, I'm having trouble using aggregate() and would greatly appreciate your advice. I am using R 1.5.1 on Windows 2000. I want to call my function in the following way extract.data(x=dat[, "Age", "Year"]) where extract.data() uses aggregate() to count the number of cases for each combination of "Age" and "Year". I've defined

Hi, I am running a loop to plot multiple plots. In s-plus, it shows multiple pages in the graphic window to allow checking on each plot. but in R, the next plot always overwrite the previous one, so i can only have the last plot produced, is there a way to have multiple pages in the graphic window just like S-plus does? Thanks

I have written the following function to calculate the weighted mean difference for univariate data (see http://www.xycoon.com/gini_mean_difference.htm for a related formula). Unsurprisingly, the function is slow (compared to sd or mad) for long vectors. I wonder if there's a way to make the function faster, short of creating an external C function. Thanks very much for your advice. gmd

Hi everyone, Here's how I solved a problem for my stats class. I'm pretty sure I understand what's going on, but I wonder if there's a more direct way to solve it. Problem summary: A recent poll indicated that Candidate A is leading B with 55% of the vote. How many voters need to be surveyed to ensure a margin of error of +/- 2.5% with 99% confidence. Here's what I did:

Hi, Suppose I have a multidimensional array: tmp <- array(1:8, c(2,2,2)) is there a function out there that, given a one-dimensional array index, will return the separate indices for each array dimension? for instance, tmp[8] is equivalent to tmp[2,2,2]. I'd like to derive the vector (2,2,2) from the index 8. thanks, Brad Buchsbaum

Dear R-help, I am using R 2.1.1 on Windows XP. I have a tab-delimited data file that has been exported by SAS. The file is reasonably big so I apologise that I can't give a good toy example. I do this: table(count.fields("t1.txt", sep="\t", quote="\"")) 248 809 So I have 809 lines, each with 248 fields. There's something wrong with

Hello List How do I turn R> simple.example.alphabetic [,1] [,2] [,3] [1,] "a" "b" "c" [2,] "d" "e" "f" [3,] "g" "h" "i" into R> simple.example.numeric [,1] [,2] [,3] [1,] 1 2 3 [2,] 4 5 6 [3,] 7 8 9 [ie "a" becomes 1, ..., "z"

Hello, I have trouble with my cluster analysis using package "cluster". "diana" and "agnes" both seem to try to allocate memory directly, so I can not use virtual memory of my Windows2000 operation system. I do have 320 MB of memory. But they claim about 600 MB. Do I have a chance to do the analysis with my amount of memory. Thanks for all comments, I did not find a

Hi, I just installed R and am comparing it to other packages (such as Igor). So, you'll have to excuse me if this is a stupid question. I run the simple command: plot(1:1000000) And it seems SO slow! Igor blasts through this. My theory is that R is redrawing the screen for every point that's being graphed. Is it possible to control how often R redraws a plot as its building it -

Hello R users, I wish to draw a type of horizontal bar chart for two groups (males and females). The values for one group will start at the y-axis and point to the left, and the values for the other group will start at the y-axis and point to the right. If you're (un)lucky, the resulting graph can assume the shape of a Christmas tree. The data are left.side <- c(107092, 113053,

I am participating in a project in the university, and appeared a doubt: if can I call one function from R as "solve" from C code. The intention of the research is to create a DLL. Is it possible and where can I find an example? Sorry for bad english! ___________________________________________________________________________________ Acesse nosso portal www.click21.com.br Porque

I've seen that there's an history for graphics. How can I save it manually? Can I save more than 4 plots? I'm using R1.6.2 under win98 [[alternative HTML version deleted]]

Hey, All Now I have a data set which is n-dimensional. And want to plot the Scatter Plot Matrix which is n by n. Does R have such function to achieve this? Thanks for your point. Fred