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diff --git a/math/iminterp/doc/msivector.hlp b/math/iminterp/doc/msivector.hlp new file mode 100644 index 00000000..d6561be7 --- /dev/null +++ b/math/iminterp/doc/msivector.hlp @@ -0,0 +1,54 @@ +.help msivector Dec98 "Image Interpolation Package" +.ih +NAME +msivector -- evaluate the interpolant at an array of x and y points +.ih +SYNOPSIS +msivector (msi, x, y, zfit, npts) + +.nf + pointer msi #I interpolant descriptor + real x[npts/4*npts] #I x values, 1 <= x <= nxpix + real y[npts/4*npts] #I y values, 1 <= y <= nypix + real zfit[npts] #O interpolated values + int npts #I number of points +.fi +.ih +ARGUMENTS +.ls msi +The pointer to the sequential interpolant descriptor +.le +.ls x, y +The array of x and y values at or in the case tof the drizzle interpolant the +array of quadrilaterals over which to evaluate the interpolant. +.le +.ls zfit +The interpolated values. +.le +.ls npts +The number of points. +.le +.ih +DESCRIPTION +The polynomial coefficients are calculated directly from the data points, +The polynomial interpolants are evaluated using Everett's central difference +formula. The spline interpolant uses the B-spline coefficients +calculated using the MSIFIT routine. The boundary extension algorithm is +projection. + +The sinc interpolant is evaluated using a array of data points around +the point in question. The look-up table since is computed by convolving +the data with a pre-computed look-up table entry. The boundary extension +algorithm is nearest neighbor. + +The drizzle interpolant is evaluated by summing the data over the +list of user supplied quadrilaterals. +.ih +NOTES +Checking for out of bounds and INDEF valued pixels is the responsibility +of the user. MSIINIT or MSISINIT and MSIFIT must be called before using +MSIVECTOR. +.ih +SEE ALSO +msieval, mrieval +.endhelp |