On 24 Apr 2014, at 11:25 , Sebastian Tleye <stleye@gmail.com> wrote:

Thanks Markus, I didn't try it but I will!

2014-04-24 11:20 GMT+02:00 Markus Fritsche <mfritsche@reauktion.de>:

On 2014-04-24 11:10, Sebastian Tleye wrote:

Hi,

I am doing some experiments in Pharo and I need to model Normal and Log-Normal distributions in pharo.
Is there any existing package for that?

Hello Sebastion,

have you tried the "NumericalMethods" Package in the Configuration browser? It loads a package "DHB", which includes the class DhbNormalDistribution.


Best regards,
�� Markus

If the package is anything like the one in VisualWorks (In other words, LogNormalDistribution a subclass of ProbabilityDensityWithUnknownDistribution), you probably want to implement

LogNormalDistribution >> distributionValue: aNumber

"Answers the probability of observing a random variable distributed according to

the receiver with a value lower than or equal to aNumber."

^aNumber > 0��

ifFalse: [0]

ifTrue: [normalDistribution distributionValue: aNumber ln]

rather than rely on the supers implementation, if you plan on using it.

Cheers,

Henry