Precisely, if there are only two input arguments, then the output will be the pp-form of this interpolant, while, if there is a third input argument, xx , then the output will be the values of the interpolants at the points specified by xx . Otherwise, xx must be a list of m -vectors and, the corresponding list of values of the interpolant at these points is returned.
Examples See the demo csapidem for various examples.
If the sequence x is not nondecreasing, both x and y will be reordered in concert to make it so.