Ok. These operations are on a string and the result is added to a data.frame. I have strings of the form "x,y,z,a,b,c,d<d>a,b,c,d,e,f,g<d> essentially comma separated values delimited by a <d> I first do a unlist(strsplit(string,split="<d>")) and then a strsplit(string,split=",")
The list of vectors i end up with is added row by row to a preallocated data.frame like.. df[i,]<-list[[i]] all of this is in a for loop and it runs for 1000 times atleast and the strings are 7000 to 8000 characters in length On Fri, Sep 10, 2010 at 9:14 AM, jim holtman <jholt...@gmail.com> wrote: > First thing to do is to use Rprof to profile your code to see where > the time is being spent, then you can make a decision as to what to > change. Are you carrying out the operations on a dataframe, if so can > you change it to a matrix for some of the operations? You have > provided no idea of what your code or data looks like, or how often > each of the operations is being done. > > There are probably many ways of speeding up the code, but with no idea > of what the code is, no solutions can be specified. > > On Thu, Sep 9, 2010 at 11:09 PM, rajesh j <akshay.raj...@gmail.com> wrote: > > Hi, > > > > I perform the operations unlist,strsplit,gsub and the for loop on a lot > of > > strings and its heavily slowing down the overall system. Is there some > way > > for me to speeden up these operations..maybe like alternate versions that > > exist which use multiprocessors etc. > > > > -- > > Rajesh.J > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > > > -- > Jim Holtman > Cincinnati, OH > +1 513 646 9390 > > What is the problem that you are trying to solve? > -- Rajesh.J [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
