ulab: Update from upstream

Closes: #2787

shared-bindings/ulab/__init__.rst

@@ -191,6 +191,38 @@ Basic Array defining functions
    Return a new 1-D array with ``num`` elements ranging from ``start`` to ``stop`` linearly.
 
 
+:mod:`ulab.compare` --- Comparison functions
+============================================
+
+.. module::ulab.compare
+
+.. method:: clip(x1, x2, x3)
+
+   Constrain the values from ``x1`` to be between ``x2`` and ``x3``.
+   ``x2`` is assumed to be less than or equal to ``x3``.
+
+   Arguments may be ulab arrays or numbers.  All array arguments
+   must be the same size.  If the inputs are all scalars, a 1-element
+   array is returned.
+
+   Shorthand for ``ulab.maximum(x2, ulab.minimum(x1, x3))``
+
+.. method:: maximum(x1, x2)
+
+   Compute the element by element maximum of the arguments.
+
+   Arguments may be ulab arrays or numbers.  All array arguments
+   must be the same size.  If the inputs are both scalars, a number is
+   returned
+
+.. method:: minimum(x1, x2)
+
+   Compute the element by element minimum of the arguments.
+
+   Arguments may be ulab arrays or numbers.  All array arguments
+   must be the same size.  If the inputs are both scalars, a number is
+   returned
+
 
 :mod:`ulab.vector` --- Element-by-element functions
 ===================================================