Thanks Marc. I forwarded the suggestion to Dr. Wuertz and Dr. Chalabi at Rmetrics.
Warm regards, Andrew Borden Marc Schwartz-3 wrote: > > On Jul 10, 2009, at 9:07 AM, tradenet wrote: > >> >> Thanks Marc! >> >> I just found that the ~500 char limitation via an online search for >> the >> specs for the formula class >> The rmetrics library I'm using get's it's character array of assets by >> parsing a formula passed as an input parameter to the >> portfolioBacktest >> function. Can I copy the portfolioBacktest function from the >> source, call >> it portfolioBackest_hack, add an additional pamater, an array of asset >> names, and have my version use this argument instead of parsing the >> formula? >> I'm fairly new to R so I don't know if R will find my function and >> if my >> function will find the other fPortfolio functions that may be >> referenced by >> the original, non "_hack" version of the function. >> >> Warm regards, >> >> Andrew > > Hi Andrew, > > Happy to help. > > In terms of your proposal as a short term fix, it may be possible to > do that. If you do create a new local function and call it directly, > it will be seen instead of the package default version of the same > function. However, without reviewing the code and package in detail, > you have to be careful about other function dependencies and namespace > issues that may be present. I would go ahead and try it to see it it > works. > > A better and longer term approach would be to have the function > author(s) modify the way in which they manipulate the formula object. > They may wish to review this thread from 2001: > > https://stat.ethz.ch/pipermail/r-help/2001-August/014628.html > > Back then, the as.character() limit was 60 and was increased by Prof. > Ripley to 500 in response to that discussion. > > However, in that thread, Prof. Ripley also proposes a better way of > manipulating the formula object passed to the function. That approach > uses deparse() rather than using as.character(). > > HTH, > > Marc Schwartz > > ______________________________________________ > [email protected] 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. > > -- View this message in context: http://www.nabble.com/strange-strsplit-gsub-problem-0-is-this-a-bug-or-a-string-length-limitation--tp24426457p24429282.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ [email protected] 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.
