       • To: mathgroup at smc.vnet.net
• Subject: [mg122795] Re: Question about Manipulate
• From: Richard Hofler <rhofler at bus.ucf.edu>
• Date: Thu, 10 Nov 2011 06:56:31 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201111091124.GAA11113@smc.vnet.net>

```Hello,

If you really want to follow the steps you show in your original post, then you can make f a function.

Clear["Global`*"]
f[a_,b_]:=Sin[a x+b]
Manipulate[Plot[f[a,b],{x,0,4 \[Pi]}],{a,0.5,2},{b,0,2 \[Pi]}]

Richard

-----Original Message-----
From: mailcwc at gmail.com [mailto:mailcwc at gmail.com]
Sent: Wednesday, November 09, 2011 6:25 AM
To: mathgroup at smc.vnet.net

I tried the following code in Mathematica 8.0

Clear["Global`*"]
f = Sin[a x + b]
Manipulate[Plot[f, {x, 0, 4 \[Pi]}], {a, 0.5, 2}, {b, 0, 2 \[Pi]}]

The Manipulate block is showed, but the Sin function is not plotted.

When I replace f in the third line with its definition,

Clear["Global`*"]
Manipulate[ Plot[Sin[a x + b], {x, 0, 4 \[Pi]}], {a, 0.5, 2}, {b, 0, 2 \[Pi]}]

The Sin function is plotted.

Is this a bug or a limitation in Mathematica?

```

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