Re: Help with Manipulate
- To: mathgroup at smc.vnet.net
- Subject: [mg132007] Re: Help with Manipulate
- From: "Dr. Wolfgang Hintze" <weh at snafu.de>
- Date: Fri, 15 Nov 2013 06:41:17 -0500 (EST)
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Am Donnerstag, 14. November 2013 07:50:47 UTC+1 schrieb Eduardo M. A. M. Mendes: > Hello > > > > I need to create a simple demonstration based upon an exercise on poisson counting processes. Here is the code > > > > Manipulate[n/Total[z],Style["Poisson Arrival Times",18,Bold],"",Delimiter,{{z,Flatten[{0,RandomVariate[Quiet@ExponentialDistribution[\[Lambda]],n-1]}]},Button["random",z=Flatten[{0,RandomVariate[Quiet@ExponentialDistribution[\[Lambda]],n-1]}]]&,Appearance->"Labeled"},"",Delimiter,{{\[Lambda],2,"\[Lambda]"},1,100,1,Appearance->"Labeled"},"",Delimiter,{{n,10000,"n"},1,1000000,1000,Appearance->"Labeled"},SaveDefinitions->True] > > > > The idea is to generate a sequence of random numbers, then take the sum of it and keep the last value. Every time I hit "random"a new sequence is created. > > > > The above code returns the following error msg > > > > RandomVariate::array : "\"The array dimensions -1 + n given in position 2 \ > > of RandomVariate[ExponentialDistribution[=CE=BB], -1 + n] should be a list of \ > > non-negative machine-sized integers giving the dimensions for the result. \"" > > > > and some weird output. After hitting "random", the output is what I expect but the whole Manipulate output is still red indicating that there are problems. > > > > Could you be so kind to point out what I did wrong and how to fix it? I feel that I did not quite get how Manipulate works. > > > > Many thanks > > > > Ed Ed, I have simplified your code so that it now runs without error. I suggest to increase the complexitiy step by step and watch whre the error pops up. Manipulate[ n/Total[z], {{z, Flatten[{0, RandomVariate[Quiet[ExponentialDistribution[\[Lambda]]], n - 1]}]}, Button["random", z = Flatten[{0, RandomVariate[Quiet[ExponentialDistribution[\[Lambda]]], n - 1]}]] & }, {\[Lambda], 1, 10}, {{n, 2}, 1, 100}] Best regards, Wolfgang