From 40e5a5811c6ffce9b0974e93cdd927cbcf60c157 Mon Sep 17 00:00:00 2001 From: Joe Hunkeler Date: Tue, 11 Aug 2015 16:51:37 -0400 Subject: Repatch (from linux) of OSX IRAF --- math/curfit/doc/cvrefit.hlp | 52 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 math/curfit/doc/cvrefit.hlp (limited to 'math/curfit/doc/cvrefit.hlp') diff --git a/math/curfit/doc/cvrefit.hlp b/math/curfit/doc/cvrefit.hlp new file mode 100644 index 00000000..4612b4c6 --- /dev/null +++ b/math/curfit/doc/cvrefit.hlp @@ -0,0 +1,52 @@ +.help cvrefit Jun84 "Curfit Package" +.ih +NAME +cvrefit -- refit new y vector using old x vector and weights +.ih +SYNOPSIS +cvrefit (cv, x, y, w, ier) + +.nf +pointer cv # curve descriptor +real x[] # array of x values +real y[] # array of y values +real weight[] # array of weights +int ier # error code +.fi +.ih +ARGUMENTS +.ls cv +Pointer to the curve descriptor +.le +.ls x +Array of x values. +.le +.ls y +Array of y values. +.le +.ls weight +Array of weights. +.le +.ls ier +Error code. The options are OK, SINGULAR and NO_DEG_FREEDOM. If ier equals +singular a solution is computed but one or more of the coefficients may +be zero. If ier equals NO_DEG_FREEDOM, there are insufficient data points +to compute a solution and CVREFIT returns without solving for the coefficients. +.le +.ih +DESCRIPTION +In some application the x and weight values remain unchanged from fit to fit +and only the y values vary. In this case it is redundant to reaccumulate +the matrix and perform the Cholesky factorization. CVREFIT zeros and +reaccumulates the vector on the right hand side of the matrix equation +and performs the forward and back substitution phase to fit for a new +coefficient vector. +.ih +NOTES +In the first call to CVREFIT space is allocated for the non-zero basis +functions. Subsequent call to CVREFIT reference this array to avoid +recaculating basis functions at every call. +.ih +SEE ALSO +cvfit, cvaccum, cvsolve, cvchoslv +.endhelp -- cgit