lsutil.h Source File

00001 #ifndef LSUTIL_H
00002 #define LSUTIL_H
00003 
00004 /*
00005   lsutil.h
00006 
00007   Least squares best fit utility functions
00008   */
00009 
00010 /* ident tag */
00011 #ifndef __GNUC__
00012 #ifndef __attribute__
00013 #define __attribute__(x)
00014 #endif
00015 #endif
00016 
00017 static char __attribute__((unused)) lsutil_h[] = "$Id: lsutil.h,v 1.3 2000/10/27 20:34:42 terrylr Exp $";
00018 
00019 /*
00020   given arrays of points x, y, and number of points n,
00021   computes the least squares best fit line y = a x + b,
00022   putting the coefficients in the passed pointer args.
00023 
00024   Returns 0 if OK, -1 if only one point, or a = inf
00025   */
00026 extern int lsCoeff(double *x, double *y, int n, double *a, double *b);
00027 
00028 /*
00029   given arrays of points x, y, number of points n, and the
00030   point d where y must be 0, computes the least squares best
00031   fit line y = a (x - d), putting the coefficient in the passed
00032   pointer arg a.
00033 
00034   Returns 0 if OK, -1 if only one point, or a = inf
00035   */
00036 extern int lsCoeffOD(double *x, double *y, int n, double d, double *a);
00037 
00038 #endif /* LSUTIL_H */