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cspline_extr, x, y [, axis, pos=pos,
minpos=minpos, minval=minval, maxpos=maxpos,
maxval=maxval [, /periodic]
This routine determines extreme values on the curve interpolated between
data points (x,y) using natural cubic splines.
axis (a scalar) specifies along which dimension values of
y must be taken. By default, 0 is assumed. The values in
x must be in ascending order, and there must be one value
in x for each value along the selected dimension in
y. If pos is specified, then it must be a
scalar and indicates the x coordinate at which the search for an
appropriate local extreme must begin; otherwise, absolute extreme values
are sought. Found extreme values and their locations are returned in
minpos, minval, maxpos, and maxval
as appropriate.
See also: cspline