> From: Douglas Bates [mailto:[EMAIL PROTECTED] On > > "Liaw, Andy" <[EMAIL PROTECTED]> writes: > > > Can some one tell me if it's possible to have conditional > importFrom() in > > the package NAMESPACE file? Basically I'd like to know if > it's possible to > > make the NAMESPACE file compatible with R 1.9.0 and those > 1.8.1 and earlier. > > The problem is that I want to import cmdscale(), which is > in `mva' prior to > > 1.9.0 but in `stats' post 1.9.0. > > Well, we've got good news and bad news. The good news is that there > are facilities for conditionals in the NAMESPACE file. The bad news > is that they were introduced in 1.9.0 so you can't use them for the > purpose you have in mind. > > The way many of us have approached this is to freeze a version of the > package that works for R-1.8.1 and add R(<= 1.8.1) to Depends: in the > DESCRIPTION file. > > Then bump the version number, switch to importFrom(stats, ...) in the > NAMESPACE and add R(>= 1.9.0) to the Depends: line.
Thanks very much, Doug. I suppose one ugly way of getting around this is not to import cmdscale in NAMESPACE, but to check for R version and do the appropriate require() inside the function that needs cmdscale(). Or is that really too ugly? Best, Andy ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
