Re: Manipulate a complex expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg77813] Re: Manipulate a complex expression*From*: Januk <ggroup at sarj.ca>*Date*: Sun, 17 Jun 2007 06:09:30 -0400 (EDT)*References*: <f505ip$qug$1@smc.vnet.net>

Hi Daniele, On Jun 16, 4:04 am, Daniele <d.mal... at gmail.com> wrote: <snip> > if I define VolumeFraction (eg. VolumeFraction=0.1) and plot > Re[MeasuredCMF] vs. f, I have no problem. > But I am unable to successfully do the following (I get a blank plot) > > Manipulate[ > LogLinearPlot[ > Evaluate[Re[MeasuredCMF]], {f, 1 10^5, 1 10^9}], {{VolumeFraction, > 0.2}, 0.1, 0.5}] <snip> You pretty much have it. You just need to force Mathematica to use the local variable from the Manipulate. One easy way is to use ReplaceAll to rename VolumeFraction to a temporary variable (VolumeFraction2): Manipulate[ LogLinearPlot[ Evaluate[ Re[MeasuredCMF] /. {VolumeFraction -> VolumeFraction2}], {f, 10^5, 10^9}], {{VolumeFraction2, 0.2}, 0.1, 0.5}] Good luck!