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diff --git a/math/surfit/doc/isinit.hlp b/math/surfit/doc/isinit.hlp new file mode 100644 index 00000000..e0f2123c --- /dev/null +++ b/math/surfit/doc/isinit.hlp @@ -0,0 +1,61 @@ +.help isinit Apr85 "Surfit Package" +.ih +NAME +isinit -- initialize surface grid descriptor +.ih +SYNOPSIS +include <math/surfit.h> + +.nf +isinit (sf, surface_type, xorder, yorder, xterms, ncols, nlines) +.fi + +.nf +pointer sf # surface descriptor +int surface_type # surface function +int xorder # order of function in x +int yorder # order of function in y +int xterms # include cross-terms? (YES/NO) +int ncols # number of columns in the surface grid +int nlines # number of lines in the surface grid +.fi +.ih +ARGUMENTS +.ls sf +Pointer to the surface descriptor structure. +.le +.ls surface_type +Fitting function. Permitted values are SF_LEGENDRE and SF_CHEBYSHEV for +the Legendre and Chebyshev polynomials and SF_SPLINE1 and SF_SPLINE3 +for the linear and bicubic splines. +.le +.ls xorder, yorder +Order of the polynomial to be fit in x and y or the number of spline pieces to +be fit in x and y. The orders must be greater than or equal to 1. +.le +.ls xterms +Include cross-terms? If xterms = YES coefficients are fit to terms containing +the cross products of x and y polynomials. Xterms defaults to YES for the +spline functions. +.le +.ls ncols +The number of columns in the surface grid. The surface is assumed to lie +on a rectangular grid such that 1 <= x <= ncols. +.le +.ls nlines +The number of lines in the surface to be grid. The surface is assumed to lie +on a rectangular grid such that 1 <= y <= nlines. +.le +.ih +DESCRIPTION +ISINIT allocates space for the surface descriptor and the arrays and vectors +used by the numerical routines. It initializes all arrays and vectors to zero, +calculates and stores the basis functions in x and y +and returns the surface descriptor to the calling routine. +.ih +NOTES +ISINIT must be the first SURFIT routine called. +.ih +SEE ALSO +isfree +.endhelp |