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sieve( [data,] condition)
Returns a 1d array containing those elements of numerical variable
data for which the corresponding element of
condition is non-zero. If condition isn’t met
anywhere, then scalar -1 is returned. If data is
not specified, then the indices of non-zero elements of
condition are returned (i.e. equivalent to
sieve(indgen(long(condition)),condition)).
See also: match