Files:
xfrpr.c - driver function for conjugate gradient algorithm

Inside xfrpr.c, values and derivatives for the minimization funtion are defined by
- float func(float x[]) and
- void dfunc(float x[], float d[]).

Compile & Link:
gcc -c xfrpr.c
gcc xfrpr.o -lm -lrecipes_c -o xfrpr

Run:
./xfrpr

Note:
Since the header files for Numerical Recipes are not installed now, you need to copy the three header files into your local directory.