Re: question about evaluation and Manipulate
- To: mathgroup at smc.vnet.net
- Subject: [mg78345] Re: question about evaluation and Manipulate
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Thu, 28 Jun 2007 06:33:59 -0400 (EDT)
- Organization: The Open University, Milton Keynes, UK
- References: <f5vqp7$iqj$1@smc.vnet.net>
Yaroslav Bulatov wrote:
> I'm trying to manipulate a plot where the plotted expression is a
> symbol that should be evaluated before plotting.
>
> f[x_] = a x;
> Manipulate[Plot[f[x], {x, 0, 1}], {a, 0, 1}]
>
> This doesn't work, presumably because Plot doesn't have access to the
> value of "a" set by Manipulate. So I'd like to evaluate the first
> argument Plot, but not Plot itself before Manipulate is executed, is
> there a way to do this?
Either one of the following expressions will yield the desired result.
f[a_][x_] = a*x;
Manipulate[Plot[f[a][x], {x, 0, 1}], {a, 0, 1}]
f[x_] = a*x;
Manipulate[Plot[f[x] /. a -> b, {x, 0, 1}], {b, 0, 1}]
Regards,
Jean-Marc