Reap

Reap(expr)

gives the result of evaluating expr, together with all values sown during this evaluation. Values sown with different tags are given in different lists.

Examples

>> Reap(Sow(3); Sow(1))
{1,{{3,1}}}

OEIS - A020652:

>> Reap(Do(If(GCD(num, den) == 1, Sow(num)), {den, 1, 20}, {num, 1, den-1}) )[[2, 1]]
{1,1,2,1,3,1,2,3,4,1,5,1,2,3,4,5,6,1,3,5,7,1,2,4,5,7,8,1,3,7,9,1,2,3,4,5,6,7,8,9,
10,1,5,7,11,1,2,3,4,5,6,7,8,9,10,11,12,1,3,5,9,11,13,1,2,4,7,8,11,13,14,1,3,5,7,
9,11,13,15,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,1,5,7,11,13,17,1,2,3,4,5,6,7,8,
9,10,11,12,13,14,15,16,17,18,1,3,7,9,11,13,17,19}

Related terms

Sow

Implementation status

• ✅ - full supported

Github

• Implementation of Reap