| Yorick Function ReferenceInterpolation and Lookup FunctionsIn the following function, y and x are one-dimensional
arrays which determine a piecewise linear function y(x). The x
must be monotonic. The xp (for x -prime) can be an array of any
dimensionality; the dimensions of the result will be the same as the dimensions
of xp.
 digitize(xp, x)   returns indices of xp values
in x
interp(y, x, xp)  returns yp, xp
interpolated
into y(x)
 integ(y, x, xp)   returns the integrals of y(x) from
x(1) to xp
 Note that integ is really an area-conserving interpolator.
If the xp coincide with x, you probably want to use
(y (zcen)*x (dif))(cum)
 instead.
 The on-line help documentation for interp describes
how to use interp and integ with multidimensional y
arrays.
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