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## Function crop

boost::histogram::algorithm::crop — Crop command to be used in `reduce`.

## Synopsis

    // In header: <boost/histogram/algorithm/reduce.hpp>

    reduce_command crop(double lower, double upper);

## Description

Command is applied to corresponding axis in order of reduce arguments.

Works like `shrink` (see shrink documentation for details), but counts in removed bins are discarded, whether underflow and overflow bins are present or not. If the cropped range goes beyond the axis range, then the content of the underflow or overflow bin which overlaps with the range is kept.

If the counts in an existing underflow or overflow bin are discared by the crop, the corresponding memory cells are not physically removed. Only their contents are set to zero. This technical limitation may be lifted in the future, then crop may completely remove the cropped memory cells.

Parameters: |
`lower` | bin which contains lower is first to be kept.
`upper` | bin which contains upper is last to be kept, except if upper is equal to the lower edge.