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BUILT-IN MATHEMATICA SYMBOL
Pick
Pick[list, sel, patt]
picks out those elements of list for which the corresponding element of sel matches patt.
Details
- sel can be a nested list of any depth.
- Pick[list, sel, patt] picks out those
for which 
matches patt. - Depending on the arrangement of elements matching patt in a nested list sel, Pick may return a ragged array.
- The heads in list and sel do not have to be List.
- Pick works with SparseArray objects.
New in 5.1
