Change in NA_REAL behavior (PR#1886)

[larsendr@missouri.edu]

Full_Name: David Larsen
Version: 1.5.1
OS: Redhat 7.2, w98, w2000
Submission from: (NULL) (128.206.66.65)


I have c code that produces vector sequences for plotting.  I use NA_REAL to
create an NA that will pass back to R to break the line.  This code worked fine
upto R-1.5.0 It continues to work on Redhat7.2 Linux but on both windows98 and
windows2000 the NA_REAL returns -6.623485e-229 on both windows systems.  I use
cygwin and gcc to compile the code which I updated in July along with R-1.5.1 
The code includes R.h, Rinternals.h, and Rmath.h 

Using this same configuration this has worked for the last year.

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