Re: Help with Manipulate

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• 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
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>
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> 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]
>
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> 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.
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> The above code returns the following error msg
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> RandomVariate::array :  "\"The array dimensions -1 + n given in position 2 \
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> of RandomVariate[ExponentialDistribution[=CE=BB], -1 + n] should be a list of \
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> non-negative machine-sized integers giving the dimensions for the result. \""
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> 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.
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> 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.
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> Many thanks
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> 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

```

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