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Redundant manipulate

• To: mathgroup at smc.vnet.net
• Subject: [mg88853] Redundant manipulate
• From: wiso <giurrero at gmail.com>
• Date: Mon, 19 May 2008 05:17:33 -0400 (EDT)

I have a manipulate like this:

Manipulate[
 Row[{"a = ", a, " b = 2 a = ", b = 2 a}]
 , {a, -10, 10, 1}, {b, -20, 20, 1}]

If I change a, then b changes, but I also want that when I change b,
then a changes. Thanks.