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Re: Help with Manipulate

  • To: mathgroup at
  • Subject: [mg131861] Re: Help with Manipulate
  • From: Tomas Garza <tgarza10 at>
  • Date: Sat, 19 Oct 2013 04:11:16 -0400 (EDT)
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First, remove the semicolon at the end of your code. This may be interfering with the displaying process.Second, bear in mind that the calculation takes a very long time if the values of your parameters get too large.Third, try to fix the PlotRange so that the plot doesn't jump all over the place as you move the controls.Lastly, I suggest a smoother way to compute the sum.
I tried the following code and it works fine:
Clear[flist];flist[par1_,par2_]:=RandomVariate[FRatioDistribution[2,2 par1],par2];Manipulate[sum=Fold[Plus,0,Table[flist[\[CurlyPhi],np],{nr}]];Histogram[sum,{Min[sum],Max[sum],1},"PDF",AspectRatio->1/3,PlotRange->{{Min[sum],Max[sum]},All},ImageSize->Large],{{\[CurlyPhi],5,"parameter"},1,50,Appearance->"Labeled"},{{np,1000,"number of data points"},1,10000,Appearance->"Labeled"},{{nr,20,"number of replications"},5,200,Appearance->"Labeled"}]

> From: emammendes at
> Subject: Help with Manipulate
> To: mathgroup at
> Date: Fri, 18 Oct 2013 04:44:48 -0400
> Hello
> Although I have been using Mathematica for a while I still consider myself a rookie.   Could someone explain what I am doing wrong with the following code, please?
> Manipulate[
> sum=RandomVariate[FRatioDistribution[2,2 \[CurlyPhi]],np];
> Do[sum=sum+RandomVariate[FRatioDistribution[2,2 > \[CurlyPhi]],np],{i,2,nr}];
> Histogram[sum,{Min[sum],Max[sum],1},"PDF",AspectRatio->1/3,PlotRange-> {{Min[sum],Max[sum]},All},ImageSize->Large],
> {{\[CurlyPhi],5,"parameter"},1,1000, Appearance->"Labeled"},
> {{np,1000,"number of data points"},1,1000000, Appearance->"Labeled"},{{nr,20,"number of replications"},5,10000, Appearance->"Labeled"}];
> Nothing shows up.
> Is there a faster way to implement the summation?
> Many many thanks
> Ed

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