v		input view
expr		expression to be evaluated

Index returns a list of row numbers for which expr is true.

This operator is shorthand for "loop -index".

set v [view {A:I B} def {1 a 2 b 3 c 4 d}]

view $v index {$(A) % 2 == 1}

0 2

(index is defined in Ratcl)