sparse-array.extract
Extracting interesting data from sparse arrays.
extract
(extract array function)Return a sparse subset of this `array` - which may be either sparse or dense - comprising all those cells for which this `function` returns a 'truthy' value.
extract-from-dense
(extract-from-dense array function)(extract-from-dense array function axes)Return a subset of this dense `array` comprising all those cells for which this `function` returns a 'truthy' value. Use these `axes` if provided.