Hi,
Maybe I'm missing the point here...but let's suppose you are working
with
"large" data sets and using functions that take a significant amount
of time
to run in R. I woulnd't like to run these functions every time I call
Sweave("myfile.Rnw") within R. What is the "common" practice
to use Sweave
in these situations. I would just run the function once, save the results
and only load them each time I run Sweave on the .Rnw file. Makes sense?
Sorry, the question seems silly, but I'd appreciate your thoughts.
Thanks,
Lars.
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Google for "cache" and "Sweave" and you will find more than one package that extend Sweave and provide kinds of caching, i.e. roughly what you have in mind anyway. Best, Uwe Ligges On 31.12.2010 21:35, Lars Bishop wrote:> Hi, > > Maybe I'm missing the point here...but let's suppose you are working with > "large" data sets and using functions that take a significant amount of time > to run in R. I woulnd't like to run these functions every time I call > Sweave("myfile.Rnw") within R. What is the "common" practice to use Sweave > in these situations. I would just run the function once, save the results > and only load them each time I run Sweave on the .Rnw file. Makes sense? > > Sorry, the question seems silly, but I'd appreciate your thoughts. > > Thanks, > Lars. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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.
My very simple approach is to check if the output file exists (within the Sweave file), and run the time-consuming bits only if it does not. As Uwe says, there are more sophisticated approaches too. Sarah On Fri, Dec 31, 2010 at 3:35 PM, Lars Bishop <lars52r at gmail.com> wrote:> Hi, > > Maybe I'm missing the point here...but let's suppose you are working with > "large" data sets and using functions that take a significant amount of time > to run in R. I woulnd't like to run these functions every time I call > Sweave("myfile.Rnw") within R. What is the "common" practice to use Sweave > in these situations. I would just run the function once, save the results > and only load them each time I run Sweave on the .Rnw file. Makes sense? > > Sorry, the question seems silly, but I'd appreciate your thoughts. > > Thanks, > Lars. >-- Sarah Goslee http://www.functionaldiversity.org
I still recommend the pgfSweave package (as usual) -- you can cache both data objects (using cacheSweave) and graphics (using pgf). Regards, Yihui -- Yihui Xie <xieyihui at gmail.com> Phone: 515-294-2465 Web: http://yihui.name Department of Statistics, Iowa State University 2215 Snedecor Hall, Ames, IA On Fri, Dec 31, 2010 at 2:35 PM, Lars Bishop <lars52r at gmail.com> wrote:> Hi, > > Maybe I'm missing the point here...but let's suppose you are working with > "large" data sets and using functions that take a significant amount of time > to run in R. I woulnd't like to run these functions every time I call > Sweave("myfile.Rnw") within R. What is the "common" practice to use Sweave > in these situations. I would just run the function once, save the results > and only load them each time I run Sweave on the .Rnw file. Makes sense? > > Sorry, the question seems silly, but I'd appreciate your thoughts. > > Thanks, > Lars. > > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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. >
On 31/12/2010 3:35 PM, Lars Bishop wrote:> Hi, > > Maybe I'm missing the point here...but let's suppose you are working with > "large" data sets and using functions that take a significant amount of time > to run in R. I woulnd't like to run these functions every time I call > Sweave("myfile.Rnw") within R. What is the "common" practice to use Sweave > in these situations. I would just run the function once, save the results > and only load them each time I run Sweave on the .Rnw file. Makes sense? > > Sorry, the question seems silly, but I'd appreciate your thoughts.As others have said, there are packages that provide caching. I haven't used them, because I like to keep my projects as self-contained as possible: adding a dependency on one of those packages is undesirable[1]. What I do in the case where there are time consuming calculations is to do all the calculations in a script, and save the results (using save()). Then the Sweave document will load the objects (using load()) and do post-processing, plotting, etc. Duncan Murdoch 1. I do generally write things that are dependent on my own patchDVI package, and curse myself for the dependency all the time.