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Comparing ray/src/common/linregr.h (file contents):
Revision 2.1 by greg, Tue Nov 12 16:55:45 1991 UTC vs.
Revision 2.2 by greg, Fri Oct 2 15:56:12 1992 UTC

# Line 15 | Line 15 | typedef struct {
15          double  slope, intercept, correlation;
16   } LRLIN;
17  
18 – extern double   sqrt();
19 –
18   #define lrpoint(x,y,l)  ((l)->xs+=(x),(l)->ys+=(y),(l)->xxs+=(x)*(x), \
19                          (l)->yys+=(y)*(y),(l)->xys+=(x)*(y),++(l)->n)
20  

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