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Question about Manipulate

• To: mathgroup at smc.vnet.net
• Subject: [mg122742] Question about Manipulate
• From: "mailcwc at gmail.com" <mailcwc at gmail.com>
• Date: Wed, 9 Nov 2011 06:24:44 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

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?

• Follow-Ups:
  • Re: Question about Manipulate
    • From: George Woodrow III <georgevw3@mac.com>
  • Re: Question about Manipulate
    • From: Daniel Lichtblau <danl@wolfram.com>
  • Re: Question about Manipulate
    • From: Richard Hofler <rhofler@bus.ucf.edu>
  • Re: Question about Manipulate
    • From: DrMajorBob <btreat1@austin.rr.com>
  • Re: Question about Manipulate
    • From: David Kahle <david.kahle@gmail.com>