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15.5.412 ordfilter

ordfilter( [order=order,] x [[, axes], width, /median, /minimum, /maximum])

Applies an order filter to dimensions axes of x, over width elements. /median selects a median filter, /minimum a minimum filter, and /maximum a maximum filter. order selects a filter that returns the element that has fraction order or less of the inspected elements below it. If axes is not specified, then the filter spans all dimensions of x. If width is even then one is subtracted from it. width defaults to 3. The filter is applied only to those elements of x for which all elements to be considered by the filter exist. For elements that are too close to the edge, the original value is retained.

See also: medfilter, minfilter, maxfilter, quantile