Paul Laub wrote: > Dear all, > > Does R offer a means by which a function can determine > whether its return value is assigned? I am using R > 2.4.1 for Windows.
Short answer: No. Long answer: You want to have a class for the object called "bigobject" below and a print/show method that provides the summary for objects of that class. Uwe Ligges > > Suppose what I am looking for is called > "return.value.assigned". Then one might use it like > this > > myfunction <- function () { > # Create bigobject here > > if (return.value.assigned()) { > bigobject > } else { > summary(bigobject) > } > } > > and > > x <- myfunction() # bigobject is assigned > > myfunction() # summary of bigobject is printed > > Octave and MATLAB have the nargout function that does > what I want, and Perl has the wantarray function > detecting the context in which a function is called. > Perhaps match.call() can be made to do what I want, > but, if so, I don't see it in reading the > documentation. > > Sincerely, > > Paul Laub > > ______________________________________________ > R-help@stat.math.ethz.ch 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. ______________________________________________ R-help@stat.math.ethz.ch 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.