[PD] cumulative distribution?
david golightly
davigoli at hotmail.com
Wed Nov 9 20:28:33 CET 2005
Are you using [until] to feed a counter, or have you been using [line]? I
had this problem too until I realized the problem wasn't [tabwrite], it was
[line]. Try something like:
[512(

[until]

[f]X[+ 1]

[f(x)]
 \
[tabwrite yourtable]
assuming your table's been resized to 512
 =^ ^ =   ^  ^^  ^^ ===
homepage:
http://www.davidgolightly.net
>From: pete mcpartlan <petemcpartlan at yahoo.co.uk>
>To: Martin Peach <martinrp at vax2.concordia.ca>, pdlist <pdlist at iem.at>
>Subject: Re: [PD] cumulative distribution?
>Date: Wed, 09 Nov 2005 19:14:23 +0000
>
>thanks martin,
>this seems to work and is roughly what i need
>
>what is the best way to write this into an array? is there a way to send a
>table an eqation other than cosinesum etc. using [tabwrite] always seems to
>have gaps...
>
>thanks
>
>pete
>
>
>
>Martin Peach wrote:
>
>>I think pete wants the hyberbolic tangent function.
>>You could try this kind of patch:
>>
>>[10.01(
>>
>>[10.01\
>>
>>[expr tanh($f1)]
>>
>>[1\
>>
>>..where you click on the message box and then shiftdrag the number box
>>upwards to see how the result goes from almost 1 to almost +1 with a
>>sharp rise around 0.0 as you go from 10 to +10.
>>To get 01 output range you just add 1 then multiply by 0.5.
>>
>>Martin
>>
>>pete mcpartlan wrote:
>>
>>>cdf i think, when i said flat at both ends i meant horizontal. so yeah,
>>>an s curve not a bell curve
>>>
>>>so yes cumulative gaussian distibution i think...
>>>
>>>sorry to clog up the list with my mathematic incompetency, but how do i
>>>integrate the pdf?
>>>
>>>thanks
>>>
>>>pete
>>>
>>>Charles Henry wrote:
>>>
>>>>hold on...what kind of distribution are you looking for? the
>>>>expression is pdf for a probability density function that flattens out
>>>>at both ends. the cdf (cumulative density) is obtained by integrating
>>>>the pdfthis is the stretched 's'
>>>>Simulating random variables by the inversion method involves taking
>>>>the integral of your chosen pdf, and putting the values in a table. Then
>>>>you can pick numbers between 0 and 1 and look up the random
>>>>variable's value. So, what distribution do you want?
>>>>
>>>>Chuck
>>>>
>>>>On 11/9/05, pete mcpartlan <petemcpartlan at yahoo.co.uk> wrote:
>>>>
>>>>
>>>>>thanks Tebjan,
>>>>>
>>>>>but...its not half a cosine because it has to flatten out at both ends.
>>>>>
>>>>>and secondly i have no idea how to take an equation like that and
>>>>>implement that in pd... maybe i didnt explain that i'm not too good at
>>>>>all that maths stuff...
>>>>>
>>>>>thanks,
>>>>>
>>>>>pete
>>>>>
>>>>>Tebjan Halm wrote:
>>>>>
>>>>>
>>>>>
>>>>>>>>(cos(x) + 1) * c with x inside the range Pi to 0 and c is a
>>>>>>>>constant
>>>>>>>>that defines the output range of the curve 0 to c ...
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>sorry, the output range will be 0 to 2*c ... because the cos range 1
>>>>>>to 1
>>>>>>gets shifted upwards by the +1 to 0..2 and c scales this range ...
>>>>>>
>>>>>>pete mcpartlan schrieb:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>hello,
>>>>>>>
>>>>>>>i need help with a maths problem... i am trying to plot a cumulative
>>>>>>>distribution curve to weight random. I have a [random] that feeds
>>>>>>>into a chain of [moses], sililar to the markov chain example but what
>>>>>>>i want to do is have a table dump into the right inlet of each moses
>>>>>>>changing the weighting. so far so good. what i need help with is the
>>>>>>>curve which needs to make it more likely for the next result to be
>>>>>>>near the same position. the attatched patch has an array with the
>>>>>>>sort of function it should be... like an s stetched at both ends...
>>>>>>>is there a way i can do this with expr? or am i going to have to type
>>>>>>>out a list for each state? i'm sure this is probably quite a simple
>>>>>>>maths problem... but beyond me... or other ideas? might it be simpler
>>>>>>>to have a longer array with the curve is then plotted at different
>>>>>>>points back into the array... but considering i'm probably going to
>>>>>>>have 16+ of these and other stuff i want to make it as simple as
>>>>>>>possible....
>>>>>>>
>>>>>>>thanks in advance and apologies for rambling a bit..
>>>>>>>
>>>>>>>pete
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>~~~~~~~~~~~~~~~~~~~~~~~~~
>>>>>www.140worthing.karoo.net
>>>>>=============
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>_______________________________________________
>>>>>PDlist at iem.at mailing list
>>>>>UNSUBSCRIBE and accountmanagement >
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>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>Charles Zachary Henry
>>>>
>>>>anti.dazed.med
>>>>Med student who needs a Mickey's
>>>>
>>>>
>>>>
>>>
>>
>>
>
>
>~~~~~~~~~~~~~~~~~~~~~~~~~
>www.140worthing.karoo.net
>=============
>
>
>
>
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