diff options
Diffstat (limited to 'math/bevington/man/polfit.3m')
| -rw-r--r-- | math/bevington/man/polfit.3m | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/math/bevington/man/polfit.3m b/math/bevington/man/polfit.3m new file mode 100644 index 00000000..9553e619 --- /dev/null +++ b/math/bevington/man/polfit.3m @@ -0,0 +1,36 @@ +.TH POLFIT 3M +.SH NAME +polfit +.SH DESCRIPTION +subroutine polfit.f + +source + Bevington, pages 140-142. + +purpose + make least-squares fit to data with a polynomial curve + y = a(1) + a(2)*x + a(3)*x**2 + a(3)*x**3 + . . . + +usage + call polfit (x, y, sigmay, npts, nterms, mode, a, chisqr) + +description of parameters + x - array of data points for independent variable + y - array of data points for dependent variable + sigmay - array of standard deviations for y data points + npts - number of pairs of data points + nterms - number of coefficients (degree of polynomial + 1) + mode - determines method of weighting least-squares fit + +1 (instrumental) weight(i) = 1./sigmay(i)**2 + 0 (no weighting) weight(i) = 1. + -1 (statistical) weight(i) = 1./y(i) + a - array of coefficients of polynomial + chisqr - reduced chi square for fit + +subroutines and function subprograms required + determ (array, norder) + evaluates the determinant of a symetrical + two-dimension matrix of order norder + +comments + valid for nterms up to 10 |