[Rd] Setting NA from C code

[Duncan Murdoch]

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?

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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