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Re: question about evaluation and Manipulate


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


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