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quantile(quantile, data [, axes])
Returns a particular quantile
of the data
along the indicated axes, i.e., that data value that
exceeds in value a fraction quantile of all compared data
values. quantile must be a number between 0 and 1.
quantile(0, data, axes) is equivalent to min(data, axes),
quantile(1, data, axes) to max(data, axes), and
quantile(0.5, data, axes) to median(data, axes). However,
use of quantile to calculate minima or maxima is not recommended,
because quantile always sorts the data while looking for the
desired quantile, whereas min and max do not do that and
are therefore faster.