
Re: Help with Manipulate
Posted:
Nov 25, 2013 11:30 PM


Hello
Thank you.
Cheers
Ed
On Nov 25, 2013, at 6:25 AM, Itai Seggev <itais@wolfram.com> wrote:
> > Button wants a function in the second argument, which is the function to be > applied to its contents when pressed. This code creates a "pure function" > (look at ref/Function in the documentation center) which ignores the button > contents but assign the value of generate to z. > > On Fri, Nov 15, 2013 at 06:40:37AM 0500, Eduardo M. A. M. Mendes wrote: >> Hello >> >> Many many thanks. >> >> I went through the code you sent me to see if I can understand it. There is one piece that I don't understand. Here is it >> >> >>> (z = generate[\[Lambda], n]) & >> >> Why do I need &? >> >> Thanks again. >> >> Cheers >> >> Ed >> >> >> On Nov 14, 2013, at 8:39 AM, Waclaw Kusnierczyk <waku@idi.ntnu.no> wrote: >> >>> Will this solve your problem: >>> >>> With[{generate = >>> RandomVariate[Quiet@ExponentialDistribution[#1], #2  1] &}, >>> Module[{z}, >>> Manipulate[ >>> z = generate[\[Lambda], n]; >>> n/Total[z], >>> Button["generate", (z = generate[\[Lambda], n]) &], >>> {{\[Lambda], 2}, 1, 100, 1}, >>> {{n, 10000}, 2, 1000000, 1000}]]] >>> >>> Best, >>> vQ >>> >>> >>> On 11/14/2013 08:11 AM, Eduardo M. A. M. Mendes wrote: >>>> >>>> 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]],n1]}]},Button["random",z=Flatten[{0,RandomVariate[Quiet@ExponentialDistribution[\[Lambda]],n1]}]]&,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 \ >>>> nonnegative machinesized 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. >> >> >  > Itai Seggev > Mathematica Algorithms R&D > 2173980700

