v		input view
list		flags

Pick returns only those rows of v for which the corresponding item in list is not zero.

set v [view A:I def {1 2 3 4 5 6 9 10 11 12}]

view $v tag N | pick {1 1 0 1 1 0 0 1 1 0}

	A	N
0	1	0
1	2	1
2	4	3
3	5	4
4	10	7
5	11	8

(pick is defined in Ratcl)