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The Greville abscissae are defined to be the mean location of k-1
consecutive knots in the knot vector for each basis spline function of order
k. With the first and last knots in the gsl_bspline_workspace
knot vector excluded, there are gsl_bspline_ncoeffs
Greville abscissae
for any given B-spline basis. These values are often used in B-spline
collocation applications and may also be called Marsden-Schoenberg points.