[R] minor error in "Writing R Extensions"?

[Faheem Mitha]

Dear People,

I just thought I would point out what looks like a minor error in "Writing
R Extensions", version 1.2.1. On pg 52 it lists

"double fmod (double x) Returns the absolute value of value of x."

The actual function in /src/nmath/fmod.c appears to be:

 *    double fmod(double x, double y);
 *
 *  DESCRIPTION
 *
 *    Floating-point remainder of x / y;

There does not seem to be another function by the same name. 

                                  Sincerely, Faheem Mitha.

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