Re: Dynamically changing 2 interdependent variables.

• To: mathgroup at smc.vnet.net
• Subject: [mg81477] Re: Dynamically changing 2 interdependent variables.
• From: dh <dh at metrohm.ch>
• Date: Wed, 26 Sep 2007 06:25:19 -0400 (EDT)
• References: <fd57vj\$25b\$1@smc.vnet.net>

```
Hi Michael,

assume you change k. The statement: k=2Pi/lam will reset k at once.

Therefore no wonder that k does not work. You need a way to distinguish

which variable has changed. Here is an attempt:

oldlam=2Pi; oldk=1;

Pi)/k]}]],{{k,1},.1,1},{{lam,2 Pi},2 Pi,2 Pi 10}]

Note also, that the ranges of k and lam should be compatible.

hope this helps, Daniel

Michael Knap wrote:

> 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],

>      " = ",

>      }]

>    ],

>   {{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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