March 2016 - Pharo-dev - lists.pharo.org

menu items shifted around

by stepharo

Hi I think that we have a bug in menu with rubric. I spotted this with Frank last summer and it is visible in profstef. When you bring the profstef menu the do it menu item is moved out of the list and put at the end of the items. In the past we got the same at the beginning of the list. Stef

March 5, 2016

feedback about 50628

by stepharo

Hi I tried to restart shooting videos for the mooc. - When I use Spotter I get a rubric error (subscript ....) Doru did you tell me that it was fixed? or did I got it wrong? - then DisplayScreen hostWindowSize: 1920@1080 is crashing the VM (and I'm not resizing the window during package load) from time to time stef

March 5, 2016

Re: [Pharo-dev] CollectionValueHolder ValueAdded ValueRemoved

by stepharo

Go for it :) Because indeed if you need to know what changed there is not that much of magic. Le 3/3/16 12:50, Peter UhnÃ¡k a Ã©crit : > This is something that was discussed some time ago but never resolved. > > To summarize: > > When working with CollectionValueHolder one can only see whether the > collection as a whole changed and not how, e.g. > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > col := OrderedCollection new asValueHolder. > col add: 1. > col add: 2. > col add: 3. > col add: 4. > col whenChangedDo: [ :c :changedValue | > 1halt. > ]. > "col = #(1 2 3 4)" > > col add: 4. "whenChangedDo: c = col, changedValue = 4" > col remove: 4. "whenChangedDo: c = col, changedValue = 4" > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > In the last two cases the changedValue is the same so I can't tell > from the block if the value was added or removed. > > My proposition: > > * introduce (at least) two more Announcements: ValueAdded and ValueRemoved > * add messages #whenAddedDo:/#whenChangedDo: > * maybe add #when:do: so it can be used as an announcable object > (valueHolder when: ValueSomething do: [ :ann | ... ]) > > The ValueAdded/ValueRemoved would be fired when an item is added, > resp. removed. > > Thierry also proposed to add an index (I'd make it optional). > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > col whenAddedDo: [ :col :addedValue :optionalIndex | "here we know for > sure that value was added" ]. > > col whenRemovedDo: [ :col :addedValue :optionalIndex | "here we know > for sure that value was removed" ] > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > Finally Thierry mentioned a way to handle situations where values are > replaced (either single one or multiple ones). As this is edge > use-case and the current behavior is pretty much random I wouldn't > address the replacement unless a defined use case emerges. > > Any thoughts, > Peter > > > >

March 5, 2016

Fwd: Re: Call about Numerical Methods in Pharo :)

by stepharo

-------- Message transfÃ©rÃ© -------- Sujet : Re: Call about Numerical Methods in Pharo :) Date : Wed, 02 Mar 2016 22:58:37 +0100 De : Souissi Sami <Sami.Souissi(a)univ-lille1.fr> Pour : stepharo <stepharo(a)free.fr> Copie Ã : Pharo Development List <pharo-dev(a)lists.pharo.org>, Any question about pharo is welcome <pharo-users(a)lists.pharo.org>, Didier Besset <didier(a)ieee.org> Dear StÃ©phane, dear all Many thanks StÃ©phane for this excellent initiative, Although I am a 'new' memer in pharo 'world' but I will be interested to see how can we enrich numerically the tool and hope that we can be able to have more generators for probability distributions (random numbers, Gamma, Log-Normal, etc) as well as some algorithms used to generale different random walks that can be used in several agent-based models (fractal; multifractal, LÃ©vy etc) I have also good experience with time-series analysis and other approaches (Bayesian), Happy to see that Serge started such development, Looking to have more interactions on these numerical issues and looking to meet you in the near future Best wishes Sami Sami Souissi, Professor UniversitÃ© Lille Sciences & Technologies UMR CNR Le Mercredi 2 Mars 2016 14:33 CET, stepharo <stepharo(a)free.fr> a Ã©crit: > Hi guys > > I met Didier Besset and we had a great hacking session and discussions > with Serge Stinckwich. > Didier would like to help Pharo and the numerical part of it. ***Big > thanks*** Didier. > > We would like to do several things: > > - Work on "Hows to" > The numerical methods in Pharo is good but the gap between us and > the math is too large :) > so the idea is to have a series of "how to ..." > - histomgram (simple, based on distribution) > > - Improve the SciPharo/NumPha (previously SciSmalltalk) library > This morning we started to implement a > ComponentPrincipalDecomposition by combining two of the > objects available in SciPharo. > Then we started to enhance the distributions to make sure that > we can plug other distribution for having > controlled random number. > > - Do a public call to know what is missing for you: this is this > mail :) > Didier would like to work on concrete cases. I love that attitude > So tell us :) > > Hernan ?? > Alex: ?? pvalue? better distribution? > Vincent: covariance? CPA? > Philippe: times series > Serge R frames? > Sami: Better random number and various distributions? > > - Organise a two day lectures with practices on concrete case in > September with a recording session. > Either at IRD Bondy or Lille. > > - Make sure that the Numerical Method book will get on lulu :) with > a better cover and title :) > > > Stef

March 5, 2016

Re: [Pharo-dev] [Pharo-users] Little how to

by stepharo

So cooooooooooooooooooooooooooool, it was on my todo with my son. --- this is really true, he came and told me I want to build my own game... And we do not have a game framework in our community --- at least one that I understand. So I was looking at Ruby or JS :( And clement show me the link and how he extracted the png. So we will do that this afternoon and add this as a challenge for the mooc I should have got faster :). Le 3/3/16 22:58, Tudor Girba a Ã©crit : > Hi, > > I wrote a little post with a how to extract sprites from a larger png file: > http://www.humane-assessment.com/blog/extracting-sprite-from-png > > Cheers, > Doru > > >> On Mar 3, 2016, at 9:23 AM, stepharo <stepharo(a)free.fr> wrote: >> >> Hi guys >> >> for the mooc I would like have a list of how to that students should look in the system and implement. >> The idea is to show to the participants that Pharo is open and that they can find information. >> For example, >> - extracting a sprite from a png file >> - access a time service of the web >> >> Now I would love to get your ideas and their solution. >> >> Stef >> >> >> > -- > www.tudorgirba.com > www.feenk.com > > "Beauty is where we see it." > > > > > >

March 5, 2016

Re: [Pharo-dev] [Pharo-users] Little how to

by stepharo

Yes but they should find them :) Le 3/3/16 18:32, Alexandre Bergel a Ã©crit : > These little how to may be included as an help in the image. > > Alexandre > -- > _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: > Alexandre Bergel http://www.bergel.eu > ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. > > > >> On Mar 3, 2016, at 5:23 AM, stepharo <stepharo(a)free.fr >> <mailto:stepharo@free.fr>> wrote: >> >> Hi guys >> >> for the mooc I would like have a list of how to that students should >> look in the system and implement. >> The idea is to show to the participants that Pharo is open and that >> they can find information. >> For example, >> - extracting a sprite from a png file >> - access a time service of the web >> >> Now I would love to get your ideas and their solution. >> >> Stef >> >> >> >

March 5, 2016

Re: [Pharo-dev] Little how to

by stepharo

Mega tx :) Le 3/3/16 15:28, Stephan Eggermont a Ã©crit : >> >> email := 'damien(a)cassou.me'. >> url := 'http://www.gravatar.com/avatar/', (MD5 hashMessage: email >> trimBoth asLowercase) hex, '.jpg'. >> (ZnEasy getJpeg: url) asMorph openInHand >> > > ifError: ["hmm, might be a png instead" > ZnEasy getPng: 'http://www.gravatar.com/avatar/', > (self hash: anEmail asLowercase),'.png?s=30'].

March 5, 2016

Re: [Pharo-dev] [Pharo-users] Numerical Methods in Pharo without FFI ?

by stepharo

> I agree with using Smalltalk when we can, and avoid FFI, except maybe > one thing... > > In Smalltalk, we could completely eliminate the Float primitives and > emulate them with Integer arithmetic. > But we don't. > > IMO we should adopt same pragmatic approach with basic operations on > vectors/matrices, and maybe also for more involved algebra. I think so too. A bit in the direction of WordArray or FloatArray? > > The guys of LAPACK decided to use a "primitive" layer BLAS because the > FORTRAN compiler was too naive to compete with specially crafted > optimizations like that of MKL. What is MKL? Marcus is telling to me since years that we should use a good math libraries like the one developed by some inria groups. > It does not make sense to compete in this area, our language is not > taylored for number crunching whatever the JIT efforts we can make, Agreed. Now what would be interesting to know is: what kind of operations do we need to attack vectorised CPU I do not remember their name but I was talking with Philippe Mougin the father of F-Script and he wanted to map his F-Script messages to vector on CPU to get all the power for crunching numbers. > > So let's use some kind of numeric primitives. Which ones? Do you have some cycles to produce a prototype so that we can learn? > That's how Matlab, NumPy, R or evry other interpreter would do it, > don't they? I would love to have - knowledge - and time Sadly I just have the energy for simple things. > It may be interesting to have some fallback code written in Smalltalk, > but it ain't gonna scale. Indeed. > So don't forget that Smallapack could leverage number crunching, > that's what it's made for... Should we put under the umbrella once we clean SciPharo? Because it should be reorganized first. stef

March 5, 2016

Re: [Pharo-dev] Call about Numerical Methods in Pharo :)

by S Krish

Emotional arguments do not change facts. Contributions of 1000's from 1970's make all of programming languages what they are. Acknowledgement of heritage period. Carry on with the great work, which future generations will acknowledge, even more the contributions of all around Pharo around today, I am sure. On Sat, Mar 5, 2016 at 1:40 PM, stepharo <stepharo(a)free.fr> wrote: > You probably leave in a protected environment but I do not live in the > same. > Did you check numPy recently or R? momemtum? > Do you think that people do not know how to count? > In 1980 my students were not even born, so how can it be better than > python, java, c#, lua, ... > > Do you think that it makes me happy to see my old friends leaving our > language and do node.js. > Seriously. > Why do you blame me? Frankly tell to leave Pharo and I will leave. I can > tell you. > I think that I need a break in my life in this moment so it would be a > good opportunity. > Because if each time I do something to improve the wealth and visibility > of our system > I get such kind of feedback then may be this is the time to do something. > Afterall I may be wrong. > Seriously if you think that I'm not doing a good job and you want to stay > with old friends > just let me know. but if I stay then do not tell me that I'm an asshole > that does not want to > promote smalltalk. > > > Stef > > Le 5/3/16 02:18, Eliot Miranda a Ã©crit : > > > > On Fri, Mar 4, 2016 at 12:08 PM, stepharo <stepharo(a)free.fr> wrote: > >> >> SciPharo? Not so great news from my POV. >> What is so much pharo specific in this library? >> Is Smalltalk scientific community large enough for yet another split? >> >> Split of what? Let us be tagged with a name of 1980 and die in peace. Yes >> this looks like a >> smart move. >> There are just Python and R and Javascript around (not talking about ruby >> and swift) >> so this is a great move. We are not the cobol of object-oriented >> programming!! >> > > When I read sentiments like this it makes me want to leave the community. > I find it so offensive that the Pharo community uses Smalltalk but wants to > distance itself. It feels like theft or massive disrespect for the > inventors of the language, or a complete lack of gratitude. > > C is older than Smalltalk and no one says "C is the cobol of low-level > imperative languages". List is much older than C but no one wants to > rename Lisp because it is perceived as old. > > Smalltalk is a beautiful name, carefully chosen to differentiate and > identify the system as different, not arrogant, not hieroglyphic. Further, > Smalltalkl /is/ different and distinctive materially. Why anyone would be > ashamed of that incredible heritage and pervasive influence is beyond me. > > Offended, > Eliot > > >

March 5, 2016

Re: [Pharo-dev] Call about Numerical Methods in Pharo :)

by S Krish

+1 On Sat, Mar 5, 2016 at 6:48 AM, Eliot Miranda <eliot.miranda(a)gmail.com> wrote: > > > On Fri, Mar 4, 2016 at 12:08 PM, stepharo <stepharo(a)free.fr> wrote: > >> >> SciPharo? Not so great news from my POV. >> What is so much pharo specific in this library? >> Is Smalltalk scientific community large enough for yet another split? >> >> Split of what? Let us be tagged with a name of 1980 and die in peace. Yes >> this looks like a >> smart move. >> There are just Python and R and Javascript around (not talking about ruby >> and swift) >> so this is a great move. We are not the cobol of object-oriented >> programming!! >> > > When I read sentiments like this it makes me want to leave the community. > I find it so offensive that the Pharo community uses Smalltalk but wants to > distance itself. It feels like theft or massive disrespect for the > inventors of the language, or a complete lack of gratitude. > > C is older than Smalltalk and no one says "C is the cobol of low-level > imperative languages". List is much older than C but no one wants to > rename Lisp because it is perceived as old. > > Smalltalk is a beautiful name, carefully chosen to differentiate and > identify the system as different, not arrogant, not hieroglyphic. Further, > Smalltalkl /is/ different and distinctive materially. Why anyone would be > ashamed of that incredible heritage and pervasive influence is beyond me. > > Offended, > Eliot >

March 5, 2016