Duncan, thanks for the response. stopifnot() looks almost right. it's very useful if assertion failures issue an error message pointing at the source file/line (such as error produces); it might also be nice (but not necessary) to allow the caller to pass in a "higher level" message to be appended to the output.
i see the problems with vectors. i might complain that the programmer has made in error in their expressions. (err on the side of over-, rather than underreporting.) cheers, Greg ______________________________________________ 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.
