+1. I just (finally) ordered the book, which should help. Three things put me off of this:
(1) (perhaps biased) how can Smalltalk code be fast enough?
(2) No examples, poor categorization
(3) The use of histograms in least squares fitting - I'm a parametric guy.
Re the dearth of examples, I created a few (attached) - barely scratching the
surface, I know. I'm really stumped on OptimzationDHB and #points:function:.
The method signature sounds like what I want to do, but I doubt that something
as "simple" as
DhbLeastSquareFit
points:self sampleDataNegativeExponentialPlusConstant
function:[ :x :a :alpha :b | a * ( (x / alpha) squared negated
exp ) + b ].
is going to be "understood." We know that x is the independent variable and a,
alpha and b are parameters to be found, but I have no idea how to express that
to the code. Any ideas?
It might be that I need to look at the optimizers, since most of my fits are
really about minimizing residuals. Is Levenberg-Marquardt anywhere in the mix?
Bill
________________________________________
From: [email protected]
[[email protected]] on behalf of Alexandre Bergel
[[email protected]]
Sent: Saturday, March 03, 2012 7:30 AM
To: [email protected]
Subject: Re: [Pharo-project] Looking for a package to do some statistics in
Pharo
I am interested in this.
Cheers,
Alexandre
On 3 Mar 2012, at 05:35, Stéphane Ducasse wrote:
> Thanks
> I was reviewer for the book of didier.
> Now I think that it would be good to revive the project and make it even
> better.
> I started to have a look. I will publish a configuration to start with.
>
> Stef
>
>
> On Mar 3, 2012, at 9:13 AM, Douglas McPherson wrote:
>
>> Indeed, you should check out DHBNumerical. I'm using it for Kalman filter
>> development/simulation, and have previously done Galois field simulation
>> using Bessett's DHBPolynomial. These are many included probability
>> distributions and statistical queries built in, so quite likely has what you
>> need. No underscores needed :)
>>
>> Doug
>>
>> On Mar 2, 2012, at 10:12 , Stéphane Ducasse wrote:
>>
>>> Hi guys
>>>
>>> I would like to know if there is a package doing some statistics in Pharo.
>>> I should check the work of didier besset but I want to know if there is
>>> more.
>>>
>>> It would be good to have such kind of package.
>>>
>>>
>>> Stef
>>>
>>
>>
>
>
--
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
Examples-DHB-Numerical.st
Description: Examples-DHB-Numerical.st
