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MathGroup Archive 2007

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Re: question about evaluation and Manipulate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg78339] Re: question about evaluation and Manipulate
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 28 Jun 2007 06:28:23 -0400 (EDT)
  • References: <f5vqp7$iqj$1@smc.vnet.net>


Hi Yaroslav ,

the variable a in the function definition is a global variable, but 

inside Manipulate a is a local variable. Therefore, these two a are 

different variables. What you can do is to define a as an argument:

f[x_,a_]=a x;

Manipulate[Plot[f[x,a],{x,0,1}],{a,0,1}]

hope this helps, Daniel





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?

> 

> 




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