This is nothing to do with the C API: isVector and isMatrix are not part of the API (see Writing R Extensions for what it is). That's the `issue' here.
On Tue, 25 Oct 2005, Dominick Samperi wrote: > Consider the R code: > mat <- matrix(seq(1,20),4,5) > is.matrix(mat) # gives TRUE > is.vector(mat) # gives FALSE > > On the other hand, if mat is passed through the .Call interface the > corresponding SEXP (call it smat) satisfies > isMatrix(smat) // TRUE > isVector(smat) // TRUE > > Consequently, you cannot distinguish matrices from vectors. Looking > at the dim attribute of a vector doesn't help because this is garbage. You can look to see if it has a dim attribute ... you could also look at the C code for is.vector. Where did you find a definition of isVector? There is one in the comments in src/main/util.c. It is not as you seem to be assuming a C analogue of is.vector. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
