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diff --git a/math/gsurfit/doc/gsder.hlp b/math/gsurfit/doc/gsder.hlp new file mode 100644 index 00000000..e1af66e9 --- /dev/null +++ b/math/gsurfit/doc/gsder.hlp @@ -0,0 +1,48 @@ +.help gsder Aug85 "Gsurfit Package" +.ih +NAME +gsder -- evaluate the derivatives of the fitted surface +.ih +SYNOPSIS +gsder (sf, x, y, zfit, npts, nxder, nyder) + +.nf +pointer sf # surface descriptor +real x[npts] # x array, xmin <= x[i] <= xmax +real y[npts] # y array, ymin <= x[i] <= ymax +real zfit[npts] # data values +int npts # number of data points +int nxder # order of x derivative, 0 = function +int nyder # order of y derivative, 0 = function +.fi +.ih +ARGUMENTS +.ls sf +Pointer to the surface descriptor structure. +.le +.ls x, y +Array of x and y values. +.le +.ls zfit +Array of fitted values. +.le +.ls npts +The number of points to be fit. +.le +.ls nxder, nyder +The order of derivative to be fit. GSDER is the same as GSVECTOR if nxder = 0 +and nyder = 0. If nxder = 1 and nyder = 0 GSDER calculates the first +derivatives of the surface with respect to x. +.le +.ih +DESCRIPTION +Evaluate the derivatives of a surface at a set of data points. +GSDER uses the coefficients stored in the surface descriptor structure. +.ih +NOTES +Checking for out of bounds x and y values is the responsibility of the +calling program. +.ih +SEE ALSO +gseval, gsvector +.endhelp |