[Image-SIG] that's enough

[Chris Mitchell]

Hey Jack,

Are you trying to model fluorophores?  If you want to model a Poisson
process you don't need any special packages, just take the negative
log of a uniformly distributed random variable from 0-1.
Mathematically, this would be saying: y = r*e(-rt), where y is a
uniform random variable, then take the integral and then the inverse
(how you turn a uniform distribution into any distribution you want).

Chris

On Mon, Jul 19, 2010 at 7:18 PM, Jack Uretsky <jlu at hep.anl.gov> wrote:
> Hi Chris-
> In answer to your question,
> this is a simulation.  The "events" are program generated; I'm trying to
> approximate a Poisson process, so the times between event pairs are
> exponentially distributed.
>                        Regards,
>                                Jack
>
> "Trust me.  I have a lot of experience at this."
>                General Custer's unremembered message to his men,
>                just before leading them into the Little Big Horn Valley
>
>
>
>
> On Mon, 19 Jul 2010, Christopher Barker wrote:
>
>> Jack Uretsky wrote:
>>>
>>>    I have a sequence of events ocurring in real time.  To each event I
>>> display a corresponing .jpg picture.  The number of events may be in the
>>> hundreds.  There are eight pictures.
>>
>> where are these "events" coming from?
>>
>> In any case, one route is to have a main wxPython application. In its
>> OnInit method, start up another thread that runs the code that listens for
>> events.
>>
>> In that code, when you get an event, call:
>>
>> wx.CallAfter(some_func_to_update_image)
>>
>> In some_func_to_update_image()
>>
>> You, well, update the image in your wxPython code. I think I already
>> posted an example of how to do that.
>>
>> You put the listening code in a separate thread, so it won't block the
>> wxPython MainLoop -- if all you are doing is displaying these images, that
>> may not be necessary, though you'll have to do something so that the user
>> can at least interact enough with the GUI enough to quit it.
>>
>> wx.CallAfter() is a way to deal with the fact that wxPython is not thread
>> safe, so you can't make GUI calls directly from another thread.
>>
>> HTH,
>>
>> -Chris
>>
>>
>>
>>
>>
>>
>> --
>> Christopher Barker, Ph.D.
>> Oceanographer
>>
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