- Pharo-users - lists.pharo.org

Rectangle and Polygon classes' bugs?
by Andreas Sunardi May 19, 2017

May 19, 2017

Pharo 5.0 It seems like a bug to me, but perhaps I misunderstand something. 1) Comment in Rectangle class >> origin:corner: method shows 'origin' should be top left and 'corner' should be bottom right. This method calls Rectangle >> setPoint:point:. But this method calculates 'origin' to be bottom left corner and 'corner' to be top right. Now all the edge and corner methods are wrong. r := Rectangle origin: 0@0 corner: 10@10. r topLeft. => (0@0) "should be 0@10" r bottomRight. => (10@10) "should be 10@0" r top. => 0 "should be 10" r bottom. => 10 " should be 0" 2) Why Polygon >> bounds (which is PathShape >> bounds) returns a rectangle with a corner 1 point larger than the actual boundary? p1 := Polygon vertices: {0@0 . 0@10 . 10@10 . 10@0}. p1 bounds. => (0@0) corner: (11@11). "should be 0@0 and 10@10" This seems to be a fix to Rectangle >> containsPoint: strange behavior. By strange behavior, I mean: r := Rectangle point: 0@0 point: 10@10. r containsPoint: 0@0. => true r containsPoint: 10@10. => false "should be true" { r topLeft . r topRight . r bottomLeft . r bottomRight } allSatisfy [ :corner | r containsPoint: corner ]. => false "should be true" I want to fix this in my image, but Rectangle is used all over the place and I'm worry I'll break a lot of things. I wonder if I just misunderstood how these are supposed to be used. Can anybody help me understand if this is intentional or a bug? PS: I looked at RectangleTest and I'm not sure I understand why they are testing what they are testing. -- Andreas Sunardi

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Has anyone got some binary search code they like for the Collection class they want to share?
by PAUL DEBRUICKER May 19, 2017

May 19, 2017

I didn't see one in the image & I'm happy to implement one but thought I'd ask before I did. Thanks Paul

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Chrome DevTools Protocol and Pharo
by Torsten Bergmann May 18, 2017

May 18, 2017

Hi, I played around with remote controlling Google Chrome from Pharo using Chrome DevTools Protocol [1] (based on WebSockets). The video shows an example using latest Pharo 6 on Mac: https://www.youtube.com/watch?v=9F5FrQTEJWY Initial Code is on GitHub [2] if someone is interested, requires OSOSX and Zinc Websockets to be loaded. Have fun T. [1] https://chromedevtools.github.io/devtools-protocol [2] https://github.com/astares/Pharo-Chrome

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Re: [Pharo-users] Seaside: WACache had the subclass responsibility to implement #store:
by Paul DeBruicker May 18, 2017

May 18, 2017

Hi Abdelghani, There is a seaside specific list here: http://forum.world.st/Seaside-General-f86180.html You'll have better luck getting prompt answers there. How did you install BootstrapMagritte? WACache is an abstract class in Seaside 3.2 so maybe the install process got something wrong. Paul Pharo Smalltalk Users mailing list wrote > Hi all, > > If run a new Seaside image then instal BootstrapMagrite I can no more > access the list of running apps in the seaside image from a browser > I type in firefox localhost:8080 and I get : > WACache had the subclass responsibility to implement #store: > > Any ideas? > > Thanks in advance > Abdelghani -- View this message in context: http://forum.world.st/Seaside-WACache-had-the-subclass-responsibility-to-im… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

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Seaside: WACache had the subclass responsibility to implement #store:
by Alidra Abdelghani May 17, 2017

May 17, 2017

Hi all, If run a new Seaside image then instal BootstrapMagrite I can no more access the list of running apps in the seaside image from a browser I type in firefox localhost:8080 and I get : WACache had the subclass responsibility to implement #store: Any ideas? Thanks in advance Abdelghani

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Fwd: Re: 11/05/17 - Tabular Data Structures for Data Analysis - Oleksandr Zaytsev
by phil＠highoctane.be May 17, 2017

May 17, 2017

---------- Message transfÃ©rÃ© ---------- De : "phil(a)highoctane.be" <phil(a)highoctane.be> Date : 11 mai 2017 10:54 Objet : Re: 11/05/17 - Tabular Data Structures for Data Analysis - Oleksandr Zaytsev Ã : "Nick Papoylias" <npapoylias(a)gmail.com> Cc : On Thu, May 11, 2017 at 10:20 AM, Nick Papoylias <npapoylias(a)gmail.com> wrote: > > > On Thu, May 11, 2017 at 5:24 AM, Oleksandr Zaytsev <olk.zaytsev(a)gmail.com> > wrote: > >> >> *A. Work done* >> >> - Downloaded the threaded VM as suggested by Esteban Lorenzano to >> make Iceberg work. And it does! I have successfully pushed my NeuralNetwork >> code to GitHub: https://github.com/olekscode/MLNeuralNetwork >> - Joined the PolyMath organization on GitHub >> - Created a repository for the TabularDataset project >> https://github.com/PolyMathOrg/TabularDataset >> <https://github.com/PolyMathOrg/TabularDataset> as a part of PolyMath >> organization on GitHub >> - Fixed a PolyMath issue #25 and made a PR >> - Read an article from Wolfram Mathematica documentation regarding >> Dataset. It was one of the reading suggestions sent to me by Nick Papoylias >> >> >> *B. Next steps* >> >> - Fix more issues of PolyMath, using Iceberg. I have to get used to >> it by the time the coding phase starts >> - Read the rest of Nick Papoylias's suggestions >> >> >> *C. Help needed* >> >> - The Dataset in Wolfram, as well as Pandas in Python, has a very >> advanced indexing system. Smalltalk has its own special conventions for >> indexing, so I think that it would be great if I got familiar with them. >> Could you suggest me some reading on this topic (what are the indexing >> conventions in Smalltalk?). >> For example, in Wolfram, I can write *dataset[[-1]]* to extract the >> last row. But in Pharo indexes can not be negative. In Pharo I would say *dataset >> last*. But how about *dataset[[-5]]*? >> >> This would be a good exercise for you ;) In Pharo you can easily add > negative indexing yourself. > > *Hint:* You know the index of the last element, since this is the size of > the collection, so... ;) > > No need for changes, this exists already. Use atWrap: index put: value and atWrap: with negative indexes. 'hello' atWrap: -2 There is a specific version for Array using a primitive. #[ 10 20 30 40 ] atWrap: -1 atWrap:0 gives you the last item. atWrap: -1 gives 30 This is different from 0 based index languages. The interesing thing about atWrap: is that it uses modulo interally so you do not need to care about that. ($/ split: 'abc/def/ghi/jkl') atWrap: -1 --> 'ghi' The Matrix class has a bunch of things API wise but the class is highly inefficient, doing copies all the time etc. It would be nice to have some kind of futures/copy on write style things in there. I miss cbind and rbind. These are useful. I have some half baked super inefficient implementations of these things for Matrix. https://stat.ethz.ch/R-manual/R-devel/library/base/html/cbind.html The ability to name columns is also nice to have. In R one does: df <- dataframe() cbind(df, c(1,2,3)) cbind(df, c(4,5,6)) names(df)<-("C1", "C2", "C3") names can be found back with: names(df) A Smalltalkish style would be welcome. Maybe looking at the Voyage queries can be helpful. Phil > Try adding an extention method to Ordrered or SequenceableCollection. > > If the Pharo by example chapter is not enough or the MOOC, read the source > itself in the core, to see how basic methods are implemented (it is less > scary, > than it sounds). > > You can also try Chapters 9, 10, 11 of the blue book (some API changes may > apply): > > <http://goog_1902892863> > http://sdmeta.gforge.inria.fr/FreeBooks/BlueBook/Bluebook.pdf > > >> - Or what is the best way of implementing this index: >> *dataset[["name"]]* (extracts a named row), *dataset[[1]*] (extracts >> the first row)? Should I create two separate messages: *dataset >> rowNamed: 'name'* and *dataset rowAt: 1*? >> >> rowNamed: rowAt: yes, look like it. But if we want to model things like R dataframes for example, this has to be seen as a vectorized operation, so you can to use row slices, column slices, and logical indexes. Check this out: http://www.r-tutor.com/r-introduction/data-frame/data-frame-row-slice https://www.r-bloggers.com/working-with-data-frames/ > The internal representation of your data-structure can be anything at the > moment, *as long as you encapsulate it.* > > (ie it can be nested OrderedCollections with meta-data for column-names to > indexes, or dictionary of collections etc). > > *If you don't expose it to the user* (ie return it from the public api, > or expect knowledge of it in argument passing), > we can easily change it later. So *first make it work, and we optimize > later ;)* > > For your case it will be a little bit trickier because *you also have the > notions of a) rows and b) columns*, which > are exposed to the user. So *you would need to create abstractions* for > these too. > > Cheers, > > Nick > >> >> - >> >> >> If someone else is having problems with Iceberg on Linux, try downloading >> the threaded VM: >> >> wget -O- get.pharo.org/vmT60 | bash >> >> And use SSH (not HTTPS) remote URL. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Pharo Google Summer of Code" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to pharo-gsoc+unsubscribe(a)googlegroups.com. >> To post to this group, send email to pharo-gsoc(a)googlegroups.com. >> To view this discussion on the web visit https://groups.google.com/d/ms >> gid/pharo-gsoc/CAEp0Uzu-8fw3dA6ezVoj-QptvLcB8cWPHvZ1tfLg1Ce8 >> qkTqfQ%40mail.gmail.com >> <https://groups.google.com/d/msgid/pharo-gsoc/CAEp0Uzu-8fw3dA6ezVoj-QptvLcB8…> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "Pharo Google Summer of Code" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to pharo-gsoc+unsubscribe(a)googlegroups.com. > To post to this group, send email to pharo-gsoc(a)googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/ms > gid/pharo-gsoc/CACEStOgLC6HbYJ8HBLHWfs5%2BwqN3ib_kdVGuVizx7G > h1c0sM%3DA%40mail.gmail.com > <https://groups.google.com/d/msgid/pharo-gsoc/CACEStOgLC6HbYJ8HBLHWfs5%2BwqN…> > . > For more options, visit https://groups.google.com/d/optout. >

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Re: [Pharo-users] HiDPI
by Stephan Eggermont May 17, 2017

May 17, 2017

Hi Tim, Steven No, it has nothing to do with Bloc. The necessary change was made by Tobias in the squeak vm some time ago, but that was destabilizing the spur vm at that time. I assume it is time to revisit it now the gc bugs seem to be gone. Stephan

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HiDPI
by Steven R. Baker May 16, 2017

May 16, 2017

Heya folks, I have a laptop with a 3K screen. Is it possible to tell Pharo to render everything at a double resolution or something? I feel like this ought to have been a solved problem already, sorry if it's really obvious and I just haven't found it. I use Debian if that matters; I suspect this just works out of the box on Macs. Cheers! -Steven

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[Zinc] ZnInvalidUTF8: Illegal leading byte for utf-8 encoding
by Udo Schneider May 15, 2017

May 15, 2017

All, I'm hitting an error where fetching web content fails. The website does indeed use invalid characters. The easiest way to reproduce: ZnEasy get: 'http://www.darkreading.com/partner-perspectives/malwarebytes/locky-returns-…' Is there any way to tell Zinc to simply ignore that error and to continue? CU, Udo

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Is there a bind key to go to next argument?
by Andreas Sunardi May 15, 2017

May 15, 2017

Is there a bind key to jump to the next argument slot? After using TAB for method completion, I wonder if there's a key/command to jump to the next argument slot. I checked the keymap browser and either it isn't there or I missed it. The closest I've done so far is Meta + Right, but this needs to be performed 3 times to go to the next argument. -- Andreas

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