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

Re: [Pharo-users] Little how to

by Tudor Girba

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 3, 2016

PharoLauncher eventual slowdown

by Peter UhnÃ¡k

Hi, I've been using Pharo Launcher for quite a while and problem that I am constantly encountering is that launching of it becomes slower and slower. Up until now I've solved it by writing a bash script that downloads the launcher fresh and reconfigures it. And then I've executed the script about once a week. But I am little bit fed-up by itâ¦ is this a common behavior? Or is it constrained to my machine? For example, if I execute the following (so I can time it) time /opt/pharo-vm/cog/pharo --nodisplay --textenc UTF-8 /opt/pharo-launcher/PharoLauncher.image eval '1+1' (also I have right now about ~27 images in the Launcher) fresh download (yesterday): ~0.49s today: 0.91s (almost double) and in a week it will be be maybe 10 seconds. I can just setup cronjob that resets pharo launcher every day, but a systemic solution would be better. Thanks, Peter

March 3, 2016

Re: [Pharo-users] Little how to

by Alexandre Bergel

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> 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 3, 2016

Re: [Pharo-users] Making STON exportation lighter

by Cyril Ferlicot

HI, There is a method in the class side of Object to override. This method return all the instVar name that need to be serialized. You can override it to store only the text. For example: Text class >>stonAllInstVarNames "Override to encode my instances using a custom set of instance variables or to define their order." ^ self allInstVarNames \ #runs On Thu, Mar 3, 2016 at 5:55 PM, Offray Vladimir Luna CÃ¡rdenas <offray.luna(a)mutabit.com> wrote: > Hi, > > I'm using STON as my notebook storage file format for grafoscopio[1]. One > example of such notebooks is at [2], but they grow large easily. That's > because STON serialize a lot of information of each node. A snipped of such > info is something like [3], showed at the end of this mail. I remember that > someone told me about a way to store only the #string part of the Text node, > without any #runs or #values information in STON. How can this be done? > > Thanks, > > Offray > > Extra links and info: > > [1] http://mutabit.com/grafoscopio/index.en.html > [2] > http://mutabit.com/repos.fossil/grafoscopio/doc/tip/Docs/Es/Tutoriales/tuto… > > =[3][STON code sniped]======= > > GrafoscopioNode { > #header : 'LecciÃ³n > 1: Bienvenida', > #headers : > OrderedCollection [ ], > #key : '', > #body : Text { > #string : > '\"Hola!, Soy el profesor Stef. Debes querer que te ayude a aprender > \rPharo. AsÃ que vamos a la primera lecciÃ³n: aprender a ejecutar cÃ³digo. > \rPara ello hay varias opciones:\r - OpciÃ³n 1: Selecciona el texto debajo, > o coloca el cursor luego del punto, dale clic derecho y selecciona \'do it > (d)\'\r - OpciÃ³n 2: Haz click en el botÃ³n con el Ãcono de play que aparece > justo cerca a la esquina superior\r derecha de este > panel\"\n\nPharoTutorial openPharoZenWorkspace \"no se qpoeadÃ±l > aldskfjlasdf\"\r', > #runs : > RunArray { > > #runs : [ > > 421, > > 2, > > 13, > > 1, > > 21, > > 1, > > 1, > > 26, > > 1, > > 1, > > 1 > ], > > #values : [ > > [ > > TextColor { > > #color : Color { > > #rgb : 451328430, > > #alpha : 255 > > } > > }, > > TextFontChange { > > #fontNumber : 1 > > } > > ], > > [ > > TextColor { > > #color : Color { > > #rgb : 0, > > #cachedDepth : 32, > > #cachedBitPattern : Bitmap [ > > 4278190080 > > ], > > #alpha : 255 > > } > > }, > > @18 > > ], > > [ > > TextColor { > > #color : Color { > > #rgb : 512, > > #alpha : 255 > > } > > }, > > RubTextClassLink { > > #className : #PharoTutorial > > }, > > RubTextClassLink { > > #className : #PharoTutorial > > }, > > RubTextClassLink { > > #className : #PharoTutorial > > }, > > RubTextClassLink { > > #className : #PharoTutorial > > > > ================== > -- Cheers Cyril Ferlicot

March 3, 2016

Making STON exportation lighter

by Offray Vladimir Luna CÃ¡rdenas

Hi, I'm using STON as my notebook storage file format for grafoscopio[1]. One example of such notebooks is at [2], but they grow large easily. That's because STON serialize a lot of information of each node. A snipped of such info is something like [3], showed at the end of this mail. I remember that someone told me about a way to store only the #string part of the Text node, without any #runs or #values information in STON. How can this be done? Thanks, Offray Extra links and info: [1] http://mutabit.com/grafoscopio/index.en.html [2] http://mutabit.com/repos.fossil/grafoscopio/doc/tip/Docs/Es/Tutoriales/tuto… =[3][STON code sniped]======= GrafoscopioNode { #header : 'LecciÃ³n 1: Bienvenida', #headers : OrderedCollection [ ], #key : '', #body : Text { #string : '\"Hola!, Soy el profesor Stef. Debes querer que te ayude a aprender \rPharo. AsÃ que vamos a la primera lecciÃ³n: aprender a ejecutar cÃ³digo. \rPara ello hay varias opciones:\r - OpciÃ³n 1: Selecciona el texto debajo, o coloca el cursor luego del punto, dale clic derecho y selecciona \'do it (d)\'\r - OpciÃ³n 2: Haz click en el botÃ³n con el Ãcono de play que aparece justo cerca a la esquina superior\r derecha de este panel\"\n\nPharoTutorial openPharoZenWorkspace \"no se qpoeadÃ±l aldskfjlasdf\"\r', #runs : RunArray { #runs : [ 421, 2, 13, 1, 21, 1, 1, 26, 1, 1, 1 ], #values : [ [ TextColor { #color : Color { #rgb : 451328430, #alpha : 255 } }, TextFontChange { #fontNumber : 1 } ], [ TextColor { #color : Color { #rgb : 0, #cachedDepth : 32, #cachedBitPattern : Bitmap [ 4278190080 ], #alpha : 255 } }, @18 ], [ TextColor { #color : Color { #rgb : 512, #alpha : 255 } }, RubTextClassLink { #className : #PharoTutorial }, RubTextClassLink { #className : #PharoTutorial }, RubTextClassLink { #className : #PharoTutorial }, RubTextClassLink { #className : #PharoTutorial ==================

March 3, 2016

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

by Damien Cassou

stepharo <stepharo(a)free.fr> writes: > Now I would love to get your ideas and their solution. getting a photo from an email address through gravatar: email := 'damien(a)cassou.me'. url := 'http://www.gravatar.com/avatar/', (MD5 hashMessage: email trimBoth asLowercase) hex, '.jpg'. (ZnEasy getJpeg: url) asMorph openInHand -- Damien Cassou http://damiencassou.seasidehosting.st "Success is the ability to go from one failure to another without losing enthusiasm." --Winston Churchill

March 3, 2016

Re: [Pharo-users] Little how to

by Sven Van Caekenberghe

> On 03 Mar 2016, at 09:23, 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 Time is soo simple that there is no real need for a true web service and such a service would be trivial anyway (yet I did not find any public/free ones). Here is one way to do it: | stream unixTime | stream := nil. [ "RFC 868 TCP protocol https://en.wikipedia.org/wiki/Time_Protocol " stream := ZdcSocketStream openConnectionToHostNamed: 'time.nist.gov' port: 37. unixTime := (stream next: 4) asInteger ] ensure: [ stream ifNotNil: [ [ stream close ] on: Error do: [] ] ]. DateAndTime fromUnixTime: unixTime. The real stuff is SNTP though http://en.wikipedia.org/wiki/Network_Time_Protocol http://tools.ietf.org/html/rfc2030 which is implemented in ZTimestamp and which can do much more: ZTimestampSNTPClient new remoteClock. Sven > Now I would love to get your ideas and their solution. > > Stef > > >

March 3, 2016

CollectionValueHolder ValueAdded ValueRemoved

by Peter UhnÃ¡k

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 3, 2016

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

by Serge Stinckwich

On Thu, Mar 3, 2016 at 10:43 AM, Blondeau Vincent <vincent.blondeau(a)worldline.com> wrote: > Hi, > > That's a very good idea. > For now, I use a Pharo-R binding to make the statistics, but it is better if it is directly in the image. > > For my part, it should be nice to have: > - Principal Component Analysis > - Time series I already a very simple time series class. What kind of operations you want to do on time series ? > - Correlation with several variables (Correlation matrix) + significance tests (pearson, spearman...) > - Standard statistical tests: normality, variance, mean, distribution > - And the more important is to have nice tools to visualize the data (Box plot, histogram, scatterplots, PCA ones) with a simple API for standard things but that we can customize. The best is that we are able to draw regression lines on them. But I think that is more a Roassal part. You have to ask Alex to the viz :-) Please join the SciSmalltalk ml in order to express your needs ;-) -- Serge Stinckwich UCBN & UMI UMMISCO 209 (IRD/UPMC) Every DSL ends up being Smalltalk http://www.doesnotunderstand.org/

March 3, 2016

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

by Blondeau Vincent

Hi, That's a very good idea. For now, I use a Pharo-R binding to make the statistics, but it is better if it is directly in the image. For my part, it should be nice to have: - Principal Component Analysis - Time series - Correlation with several variables (Correlation matrix) + significance tests (pearson, spearman...) - Standard statistical tests: normality, variance, mean, distribution - And the more important is to have nice tools to visualize the data (Box plot, histogram, scatterplots, PCA ones) with a simple API for standard things but that we can customize. The best is that we are able to draw regression lines on them. But I think that is more a Roassal part. Thanks for the initiative, Cheers, Vincent > -----Message d'origine----- > De : Pharo-users [mailto:pharo-users-bounces@lists.pharo.org] De la part de > stepharo > EnvoyÃ© : mercredi 2 mars 2016 14:17 > Ã : Pharo Development List; Any question about pharo is welcome; Didier > Besset; Souissi Sami > Objet : [Pharo-users] Call about Numerical Methods in Pharo :) > > 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 > !!!************************************************************************************* "Ce message et les piÃ¨ces jointes sont confidentiels et rÃ©servÃ©s Ã l'usage exclusif de ses destinataires. Il peut Ã©galement Ãªtre protÃ©gÃ© par le secret professionnel. Si vous recevez ce message par erreur, merci d'en avertir immÃ©diatement l'expÃ©diteur et de le dÃ©truire. L'intÃ©gritÃ© du message ne pouvant Ãªtre assurÃ©e sur Internet, la responsabilitÃ© de Worldline ne pourra Ãªtre recherchÃ©e quant au contenu de ce message. Bien que les meilleurs efforts soient faits pour maintenir cette transmission exempte de tout virus, l'expÃ©diteur ne donne aucune garantie Ã cet Ã©gard et sa responsabilitÃ© ne saurait Ãªtre recherchÃ©e pour tout dommage rÃ©sultant d'un virus transmis. This e-mail and the documents attached are confidential and intended solely for the addressee; it may also be privileged. If you receive this e-mail in error, please notify the sender immediately and destroy it. As its integrity cannot be secured on the Internet, the Worldline liability cannot be triggered for the message content. Although the sender endeavours to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted.!!!"

March 3, 2016