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