April 2014 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Probabilities package for Pharo?

by Henrik Johansen

On 24 Apr 2014, at 11:25 , Sebastian Tleye <stleye(a)gmail.com> wrote: > Thanks Markus, I didn't try it but I will! > > > 2014-04-24 11:20 GMT+02:00 Markus Fritsche <mfritsche(a)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

April 24, 2014

Re: [Pharo-users] Probabilities package for Pharo?

by Sebastian Tleye

Thanks Markus, I didn't try it but I will! 2014-04-24 11:20 GMT+02:00 Markus Fritsche <mfritsche(a)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 > >

April 24, 2014

Re: [Pharo-users] [ANN] BabyMock 2

by Attila Magyar

I made up an example because it makes easier to talk about this. Let's say, I want to test the #addAll: method of the OrderedCollection. If #addAll: is implemented as a loop that uses the #add: method (itemsToBeAdded do: [:each | self add: each]) then would you test the #addAll: isolated from the #add:? I think it would be a bad idea, because we're talking about an implementation detail. The #addAll: could have been implemented in a different way. Mocking the #add: couples the test to the current implementation and makes it brittle. If I change the implementation of the #addAll:, then the test will need to be changed as well, even if the functionality remained the same. You're right that if there is a bug in the #add: then 2 test cases will fail, instead of one (the localization is worse but the test is less brittle). But if I implement it in a different way, where the 2 methods have separated logic then only one will fail. Don't know if this example applies to you case or not. -- View this message in context: http://forum.world.st/ANN-BabyMock-2-tp4748530p4756179.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

April 24, 2014

Re: [Pharo-users] Probabilities package for Pharo?

by Markus Fritsche

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

April 24, 2014

Probabilities package for Pharo?

by Sebastian Tleye

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? Thanks in advance!

April 24, 2014

Re: [Pharo-users] We need *you* for the upcoming Pharo's website

by Esteban Lorenzano

Hi, I really like it as an introduction of what pharo can do :) thanks! Esteban On 23 Apr 2014, at 21:32, kilon alios <kilon.alios(a)gmail.com> wrote: > Well I tried, several times , but I am not happy with the end result. In any case I am finished with this and since I promised to upload it here it is > > > https://www.youtube.com/watch?v=Ol5ivaEATLQ > > Sorry I cannot deliver something of better quality but thats the best I can do. If you don't like it, I wont blame you :D > > > > On Tue, Apr 22, 2014 at 3:14 PM, Damien Cassou <damien.cassou(a)gmail.com> wrote: > On Mon, Apr 21, 2014 at 10:40 PM, kilon alios <kilon.alios(a)gmail.com> wrote: > > I am still on vacations and the internet is very slow here. I will be > > able to upload something by the end of this weekend. My idea is to > > illustrate 6 points in 6-10 minutes that to my opinion make Pharo a > > very useful and fun choice. > > > please do. Even if you are late, we will evaluate your screencast and > maybe replace one that is already there. Or put it in a dedicated > section somewhere else. We desperately need good screencasts. > > Thanks for the offer > > -- > Damien Cassou > http://damiencassou.seasidehosting.st > > "Success is the ability to go from one failure to another without > losing enthusiasm." > Winston Churchill > >

April 24, 2014

Re: [Pharo-users] [ANN] BabyMock 2

by Christophe Demarey

Le 23 avr. 2014 Ã 22:25, Attila Magyar a Ã©crit : > Christophe Demarey wrote >> ... but sometimes, even in a well-designed class, you may need to test a >> very small part of this class, and in this case, you need a real object >> with some mocked methods. > > I assume that there is a method need to be tested, but it calls towards an > other either public or private method of the same object. And you'd like to > mock that second method. Am I understanding correctly? right > Why can't just allow the first method to call the second one? Is it slow, > complicated to setup or requires some external resource to execute? Does it > help to extract the logic from the second method to an other object? Without > a concrete example, I'm just speculating. My point here is just to test a method in isolation. If MyClass>>methodA calls MyClass>>methodB and there is an error in MyClass>>methodB, I don't want to have the test on methodA failing but just the test on MethodB. With "cascade testing", you will get a lot of failing tests and you need to investigate to find the culprit. As you said, if the class is well designed, it is not a big trade-off to unit test a small set of methods if they are short and related but I have the feeling that it would be good to be able to do that in some cases.

April 24, 2014

Re: [Pharo-users] glorp

by Esteban Lorenzano

Hi, AFAIK, dbxtalk glorp is loading (and working) correctly in pharo3, at least for postgresql (I didnât try the rest of the drivers) Esteban On 24 Apr 2014, at 06:02, ClÃ©ment Bera <bera.clement(a)gmail.com> wrote: > Hello, > > I think Glorp is used with DBXTalk for relational databases by multiple people. > > Usually, with Pharo, people use as a persistance layer either MongoDB with the frameworks MongoTalk/Voyage. > > Gemstone is also used quite often for large scale application but Gemstone is not free. > > Regards. > > > 2014-04-23 20:34 GMT-07:00 Pablo R. Digonzelli <pdigonzelli(a)gmail.com>: > Hi all, can someone tell me if glorp is active there ar is using glorp or other persistence framework in production projects? > > Tia > > Ing. Pablo Digonzelli > Software Solutions > IP-Solutiones SRL > Metrotec SRL > 25 de Mayo 521 > Email: pdigonzelli(a)softsargentina.com > pdigonzelli(a)gmail.com > Cel: 5493815982714 > >

April 24, 2014

Re: [Pharo-users] [ANN] JNIPort for Pharo 3.0 alpha

by Joachim Geidel

Hi everbody, I have published an update of JNIPort 3.0 alpha at SmalltalkHub. Changes from the previous version: - The Java classes needed for calling back from Java into Smalltalk and for executing the regression tests have been updated. I have shortened the Java package name from org.metagnostic.jniport to just jniport, and renamed those classes which had âDolphinâ in their class name. JNIPort has been developed for Dolphin Smalltalk by Chris Uppal, but it is available for VisualWorks and Pharo, too. Therefore I decided that the references to Dolphin are obsolete. Some methods have been renamed for the same reason. - The class files in the jars have been compiled with Java 1.6. I donât think that the old class files compiled with Java 1.4 (or earlier?) would be a problem, but still... (and I donât have anything earlier than Java 1.6 anyway). - Several Smalltalk wrapper classes and methods for the renamed Java classes and methods have been renamed as well. The new names should be more obvious than the old ones. - The performance problem from the first alpha version has been partly solved. The rest is caused by longer execution times for #become: in Pharo - I canât do anything about it for the moment. If you want to use the new version, download it from SmalltalkHub, and get the archive JNIPort30-Extras.zip containing the updated jar files from the JNIPort wiki (see below). The new jar files are called JNIPort30.jar and JNIPort30-Tests.jar instead of JNIPort.jar and JNIPort-Tests.jar, such that you can use the old and the new version in parallel, if there is any need for it. For those who donât know what JNIPort is: > JNIPort is a Smalltalk library which allows Java code to be invoked from > Smalltalk. It acts as a bridge between the world of Smalltalk objects and a > Java Virtual Machine (JVM) where Java code is executing. > > If you want to try it, load it via the ConfigurationOfJNIPort. I hope this > works. If it does not, load the packages individually in the order in which > they appear in the ConfigurationOfJNIPort. > http://www.smalltalkhub.com/#!/~JNIPort/JNIPort > The next step is to read the documentation at > http://jniport.wikispaces.com/ > Otherwise, you won't know what to do next. ;-) > Download the extra files from the download page at Wikispaces, you will need > two jar files from there. Issues: - Callbacks from âforeignâ threads, i.e. threads in the Java VM other than the one in which the Smalltalk VM runs, should be handled by the callback queueing mechanism implemented by the classes in JNIPort30.jar. This mechanism ensures that the callback into Smalltalk is executed in the Smalltalk thread. This works in VisualWorks and Dolphin, but in Pharo it leads to a crash of the VM when executing the Smalltalk callback block which is installed as a native method in Java space. I have as yet no idea why this does not work. - The JNIPort wiki lacks documentation about the Pharo version and a recipe for using callbacks. The latter is hidden in the original documentation by Chris Uppal, which can be downloaded from the wiki. - No tool support in Pharo yet. In VisualWorks, there is a settings editor, storage of settings in a âregistryâ (on Windows, this is the ârealâ registry), and there are menu items in the system browser for generating Smalltalk wrapper classes for Java classes. None of this exists for Pharo yet. Best regards, Joachim Geidel

April 24, 2014

Re: [Pharo-users] glorp

by ClÃ©ment Bera

Hello, I think Glorp is used with DBXTalk for relational databases by multiple people. Usually, with Pharo, people use as a persistance layer either MongoDB with the frameworks MongoTalk/Voyage. Gemstone is also used quite often for large scale application but Gemstone is not free. Regards. 2014-04-23 20:34 GMT-07:00 Pablo R. Digonzelli <pdigonzelli(a)gmail.com>: > Hi all, can someone tell me if glorp is active there ar is using glorp or > other persistence framework in production projects? > > Tia > > ------------------------------ > *Ing. Pablo Digonzelli* > Software Solutions > IP-Solutiones SRL > Metrotec SRL > 25 de Mayo 521 > Email: pdigonzelli(a)softsargentina.com > pdigonzelli(a)gmail.com > Cel: 5493815982714 > >

April 24, 2014