Method on @infsup: X = absrev (C, X) ¶

Method on @infsup: X = absrev (C) ¶

Compute the reverse absolute value function.

That is, an enclosure of all x ∈ X where abs (x) ∈ C.

Accuracy: The result is a tight enclosure.

absrev (infsup (-2, 1))
  ⇒ ans = [-1, +1]

See also: @@infsup/abs.

Package: interval