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? > >