[Rd] maximum matrix size
peter@l@ngfelder @ending from gm@il@com
Tue Oct 2 19:22:42 CEST 2018
Does this help a little?
One thing I seem to remember but cannot find a reference for is that
long vectors can only be passed to .Call calls, not C/Fortran. I
remember rewriting .C() in my WGCNA package to .Call for this very
reason but perhaps the restriction has been removed.
On Tue, Oct 2, 2018 at 9:43 AM Therneau, Terry M., Ph.D. via R-devel
<r-devel using r-project.org> wrote:
> I am now getting the occasional complaint about survival routines that are not able to
> handle big data. I looked in the manuals to try and update my understanding of max
> vector size, max matrix, max data set, etc; but it is either not there or I missed it (the
> latter more likely). Is it still .Machine$integer.max for everything? Will that
> change? Found where?
> I am going to need to go through the survival package and put specific checks in front
> some or all of my .Call() statements, in order to give a sensible message whenever a
> bounday is struck. A well meaning person just posted a suggested "bug fix" to the github
> source of one routine where my .C call allocates a scratch vector, suggesting "resid =
> double( as.double(n) *nvar)" to prevent a "NA produced by integer overflow" message, in
> the code below. A fix is obvously not quite that easy :-)
> resid <- .C(Ccoxscore, as.integer(n),
> resid= double(n*nvar),
> Terry T.
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