Re: [R] specifications windows pc

Good morning Ruud, What sort of tasks are you going to be doing in R? Some tasks will be faster on a single core extreme type processor, and other tasks can benefit from a multi-core processor (which run at slower clock speeds than extreme single-core). If you're working with large matrices,

Re: [R] How to create a string containing '\/' to be used with SED?

Good morning, You do not need to quote a forward slash / in R, but you do need to quote a backslash when you're inputting it... so to get a string which actually contains blah\/blah... you need to use blah\\/blah

Re: [R] memory limit

Good afternoon, The short answer is yes, the long answer is it depends. It all depends on what you want to do with the data, I'm working with dataframes of a couple of million lines, on this plain desktop machine and for my purposes it works fine. I read in text files, manipulate them, convert

Re: [R] How to create a string containing '\/' to be used with SED?

What is the problem error message? I can say fred - blah1\\/blah2\\/blah3 and then the string looks like... cat(#, fred, '#\n', sep='') #blah1\/blah2\/blah3# If you just ask R to print it then it looks like... fred [1] blah1\\/blah2\\/blah3 when you're playing with strings and regular

Re: [R] exponential of a matrix

Good morning, Try expm() in the Matrix package by Douglas Bates and Martin Maechler http://www.stats.bris.ac.uk/R/web/packages/Matrix/index.html Note that there is a revised version of that paper, refer: Cleve Moler and Charles Van Loan (2003) Nineteen dubious ways to compute the exponential of

Re: [R] Pros and Cons of R

Neil Shephard wrote: Another pro to consider is the cost, you can obtain R for free, SAS/S-Plus/Stata all have licenses of some sort that require purchasing. Neil Which has the side effect of *not* restricting how many machines are available for use or where; e.g. I was running big

Re: [R] How to plot wind direction and strength field

Jenny, Have a look at the R Newsletter Volume 3/2, October 2003 Regards, Sean Jenny Barnes wrote: Dear R-help community, I have searched through the archives and not been able ot find any advice on how to plot a wind field with one arrow per grid square with the arrow pointing in

Re: [R] select rows from data based on a vector of char strings

or using the %in% operator... ?%in% data[data$label %in% flist,] regards, Sean Applejus wrote: Hi, You are right the == doesn't work, but there's a workaround using regular expressions: flist-fun|food grep(flist, data$label) will give you the vector [2 4] which are the numbers

Re: [R] Documentation General Comments

Good morning, Firstly I'd like to say that I'm a huge fan of R and I think it's great system. Part of the problem in searching for information is knowing what buzzwords / keywords to use. I was recently caught out like this as I didn't see my problem as a cumulative sum (keyword=cumsum) only

[R] running balance down a dataframe referring back to previous row

Good morning, I've searched high and low and I've tried many different ways of doing this, but I can't seem to get it to work. I'm looking for a way of vectorising a running balance; i.e. the value in the first row of the dataframe is zero, and following rows add to this running balance. This

Re: [R] spliting strings ...

Good afternoon Monica, Relying on regular expressions, substituting nothing for everything starting with a space until the end of the line (i.e. with a dollar sign) str1 - sub( .*$, , str) Regards, Sean Monica Pisica wrote: Hi everyone, I have a vector of strings, each string made

Re: [R] Re placing values job

fyi On my machine match runs *much* faster... t0 - Sys.time(); for (i in 1:reps) { match(Y,X) }; print(Sys.time() - t0) Time difference of 0.1570001 secs t0 - Sys.time(); for (i in 1:reps) { sapply(Y,function(Y){which(Y==X)}) }; print(Sys.time() - t0) Time difference of 6.093 secs 6.09/.157