Is something like this (see Array 3) more like what you need?
The idea is:
1. Each number from a given column is changed into a Boolean array. Thus the entire column becomes a 2D Boolean array.
2. The 2D Boolean is transposed. Then autoindexing will extract a row which represents a particular bit for all the numbers in the original column.
3. Determine if all bits are 0's or all 1's.
4. Auto-index to create an array of Booleans for these bits.
5. Convert Boolean array back to number.
6. Auto-index these numbers into an array.
-Kevin P.
CAUTION! New LabVIEW adopters -- it's too late for me, but you *can* save yourself. The new subscription policy for LabVIEW puts NI's hand in your wallet for the rest of your working life. Are you sure you're *that* dedicated to LabVIEW? (Summary of my reasons in this post, part of a voluminous thread of mostly complaints starting here).