On Mon, 5 Nov 2001, Duncan Murdoch wrote:
> In the maps library, NA's are inserted between polygons so lines() can
> be used to draw all polygons at once. The code to do it is like this:
>
> *x++ = NA_REAL;
> *y++ = NA_REAL;
>
> where x and y are declared as
>
> double *x, *y, *range;
>
> and are the arguments passed in through a .C call.
>
> However, the values show up in R as -6.62314033633867e-229 instead of
> NA, so the drawing gets messed up.
>
> Any suggestions as to what might be going wrong?
You are probably not importing R_NaReal, which is what NA_REAL is a macro
reference to. That's the point of globalvars.h, which the standard
Makefile forces to be included.
This will not be needed from 1.4.0 on.
>
> This is happening in Windows, using gcc 2.95.2, R source 1.3.1,
> platform i386-pc-mingw32.
>
> Duncan Murdoch
>
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--
Brian D. Ripley, ripley@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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