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MathGroup Archive 2007

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Dynamically changing 2 interdependent variables.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81420] Dynamically changing 2 interdependent variables.
  • From: Michael Knap <michael.j.knap at comcast.net>
  • Date: Sun, 23 Sep 2007 04:26:23 -0400 (EDT)

Ok, I have looked over the Documentation, but I still haven't quite
figured out how to do exactly what I want to do.

I am working on a Physics app dealing with waves, so I want to be able
to input a wave number either expressly, as k, or in terms of lambda.

This is the relationship:  k = (2 Pi) / lambda .

I want to be able to change either variable in a Manipulate[] function,
and have the other update appropriately.

This is what I have started with:

Manipulate[
  Dynamic[
   Row[{
     TraditionalForm[k = (2 Pi)/lam],
     " = ",
     TraditionalForm[2 Pi]/TraditionalForm[lam = (2 Pi)/k]
     }]
   ],
  {{k, 1}, .00001, 1},
  {{lam, 2 Pi}, 2 Pi, 100}
  ]

Notice how changing the lam slider works as expected. Changing the k
slider does not.

Any help is appreciated.


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