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diff --git a/math/iminterp/doc/asigrl.hlp b/math/iminterp/doc/asigrl.hlp new file mode 100644 index 00000000..4c3087bb --- /dev/null +++ b/math/iminterp/doc/asigrl.hlp @@ -0,0 +1,40 @@ +.help asigrl Dec98 "Image Interpolator Package" +.ih +NAME +asigrl -- integrate interpolant from a to b +.ih +SYNOPSIS +integral = asigrl (asi, a, b) + +.nf + pointer asi #I interpolant descriptor + real a #I lower limit for integral, 1 <= a <= npix + real b #I upper limit for integral, 1 <= b <= npix +.fi +.ih +ARGUMENTS +.ls asi +Pointer to the sequential interpolant descriptor structure. +.le +.ls a +Lower limit to the integral, where 1 <= a <= npix. +.le +.ls b +Upper limit to the integral, where 1 <= b <= npix. +.le +.ih +DESCRIPTION +The integral is calculated assuming that the interior polynomial, sinc, and +drizzle interpolants are stored as the data points, and that the spline +interpolant is stored as an array of B-spline coefficients. + +The integral of the sinc interpolant is computed by dividing the integration +interval into a number of equal size subintervals which are at most one pixel +wide. The integral of each subinterval is the central value times the interval +width. The look-up table sinc interpolant is not supported and defaults to +the sinc interpolant. +.ih +NOTES +ASIINIT or ASISINIT and ASIFIT must be called before using ASIGRL. +.ih +SEE ALSO |