No problems with it working. The main problem I have observed is unrealistic expectations. People write an *essentially* non-vectorized function and expect Vectorize to produce a version of it which will out-perform explicit loops every time. No magic bullets in this game.
Bill. Bill Venables CSIRO Laboratories PO Box 120, Cleveland, 4163 AUSTRALIA Office Phone (email preferred): +61 7 3826 7251 Fax (if absolutely necessary): +61 7 3826 7304 Mobile: +61 4 8819 4402 Home Phone: +61 7 3286 7700 mailto:[EMAIL PROTECTED] http://www.cmis.csiro.au/bill.venables/ -----Original Message----- From: Duncan Murdoch [mailto:[EMAIL PROTECTED] Sent: Wednesday, 5 March 2008 9:36 AM To: Venables, Bill (CMIS, Cleveland) Cc: r-help@r-project.org Subject: Re: [R] vector manipulations On 3/4/2008 5:41 PM, [EMAIL PROTECTED] wrote: > Your problem is that your function log1( , ) is not vectorized with > respect to its arguments. For a function to work in outer(...) it must > accept vectors for its first two arguments and it must produce a > parallel vector of responses. > > To quote the help information for outer: > > "FUN is called with these two extended vectors as arguments. Therefore, > it must be a vectorized function (or the name of one), expecting at > least two arguments." > > Sometimes Vectorize can be used to make a non-vectorized function into a > vectorized one, but the results are not always entirely satisfactory in > my experience. What problems have you seen? Duncan Murdoch ______________________________________________ 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.
