How to filter (compress) an array¶

Use a boolean mask with compress (/) to select elements:

      V ← 3 1 4 1 5 9 2 6
      (V>3)/V
4 5 9 6

The comparison V>3 produces the boolean vector 0 0 1 0 1 1 0 1. Compress keeps elements where the mask is 1.

Combine conditions¶

      V ← 3 1 4 1 5 9 2 6
      ((V>2)∧(V<6))/V
3 4 5

      V ← 3 1 4 1 5 9 2 6
      (V≠1)/V
3 4 5 9 2 6