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+.help asieval Dec98 "Image Interpolator Package"
+.ih
+NAME
+asieval -- procedure to evaluate interpolant at x
+.ih
+SYNOPSIS
+y = asieval (asi, x)
+
+.nf
+    pointer	asi	#I interpolant descriptor
+    real	x[2]	#I x value, 1 <= x[1-2] <= npts
+.fi
+.ih
+ARGUMENTS
+.ls asi   
+Pointer to the sequential interpolant descriptor structure.
+.le
+.ls x    
+Single X value, or pair of X values defining a range in the case of the
+drizzle interpolant.
+.le
+.ih
+DESCRIPTION
+The polynomial coefficients are calculated directly from the data points
+for the polynomial interpolants, and from the B-spline coefficients for
+the cubic spline interpolant. The actual calculation is done by adding and
+multiplying terms according to Everett's central difference interpolation
+formula. The boundary extension algorithm is projection.
+
+The sinc interpolant is computed using a range of data points around
+the desired position. Look-up table sinc interpolation is computed
+using the most appropriate entry in a precomputed look-up table.
+The boundary extension algorithm is nearest neighbor.
+
+The drizzle interpolant is computed by summing the data over the user
+supplied X interval.
+.ih
+NOTES
+Checking for out of bounds and INDEF valued pixels is the responsibility of
+the user. ASIINIT or ASISINIT and ASIFIT must be called before using ASIEVAL.
+.ih
+SEE ALSO
+asivector, arieval
+.endhelp