June 2021 - Pharo-users - lists.pharo.org

Re: Rounding in Floats

by Esteban Maringolo

I'm coming back to this because I've been bitten by these floating points things again. If in Pharo [1] you do: a := 6.7 + (32.8 - 35) It will produce: 4.499999999999997 Which, when rounded, will produce 4. In other places [2] I do the same simple addition and subtraction it produces 4.5, that when rounded will produce 5. I know now that Pharo doesn't lie to me while other systems do, and all that Richard pointed to before. The issue here is that I'm following some calculation formula that was defined in some of the "other" systems, and so when I follow such a formula I get these edgy cases where my system produces a different output. In this case the formula is for golf handicap calculations, and it caused my system to give 4 instead of 5 to a player, resulting in giving the first place to a player other than the one deserved. It was no big deal (it's not The Masters), but these cases appear from time to time. Is there any way to "configure" the floating point calculation to behave as the "other systems"? What is the best way to anticipate these situations, am I the only one being bitten by these issues? Thanks in advance for any hints about these problems. Best regards, [1] Dolphin Smalltalk, JS, Python, Ruby, Dart produces the same output as Pharo. [2] VisualWorks, VAST, Excel, VB and all calculators I tried Esteban A. Maringolo On Tue, Sep 8, 2020 at 12:45 AM Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > On Tue, Sep 8, 2020 at 12:16 AM Richard O'Keefe <raoknz(a)gmail.com> wrote: > > > > "7.1 roundTo: 0.1 should return 7.1" > > You're still not getting it. > > I was until Konrad explained it. > > > Binary floating point CANNOT represent either of those numbers. > > You seem to be assuming that Pharo is making some mistake. > > It isn't. All it is doing is refusing to lie to you. > <snip> > > The systems that print 7.1 are LYING to you, > > and Pharo is not. > > I'm not assuming a mistake from Pharo, I had a wrong expectation what > to get if I round to that precision. > I don't know whether other systems lie or simply fulfill user > expectations, if you send the #roundTo: to a float, I did expect to > get a number with the same precision. > That is my expectation as a user. As in the other thread I expected > two scaled decimals that are printed equal to also be compared as > equal (which they don't). > > Whether there is a good reason for those behaviors is beyond my > current comprehension, but it certainly doesn't follow the "principle > of least surprise". > > In any case, the method proposed by Tomohiro solved my issues. > > Regards, > > Esteban A. Maringolo

June 14, 2021

[ANN] Hyperspace v2.8.0 [v2.8.0] released!

by Buenos Aires Smalltalk

June 14, 2021

Re: [ANN] Pharo-ODBC

by Esteban Maringolo

Thank you John! This is very good news! Best regards, Esteban A. Maringolo On Mon, Jun 14, 2021 at 6:29 AM John Aspinall <john.aspinall(a)gmail.com> wrote: > > There is now an ODBC framework for Pharo, available at the pharo-rdbms github site: > > https://github.com/pharo-rdbms/Pharo-ODBC > > This is based on the Dolphin Smalltalk Database Connection ODBC framework. Provided a suitable driver manager is installed this should work on MacOS and Linux in addition to Windows. > > Thanks to InfOil for supporting the development, to Torsten for tidying up and hosting the code, and Andy and Blair (Dolphin developers) for the original framework. > > Regards, > > John Aspinall

June 14, 2021

Re: [ANN] Pharo-ODBC

by StÃ©phane Ducasse

Thanks john this is a great news! S. > On 14 Jun 2021, at 11:29, John Aspinall <john.aspinall(a)gmail.com> wrote: > > There is now an ODBC framework for Pharo, available at the pharo-rdbms github site: > > https://github.com/pharo-rdbms/Pharo-ODBC <https://github.com/pharo-rdbms/Pharo-ODBC> > > This is based on the Dolphin Smalltalk Database Connection ODBC framework. Provided a suitable driver manager is installed this should work on MacOS and Linux in addition to Windows. > > Thanks to InfOil for supporting the development, to Torsten for tidying up and hosting the code, and Andy and Blair (Dolphin developers) for the original framework. > > Regards, > > John Aspinall -------------------------------------------- StÃ©phane Ducasse http://stephane.ducasse.free.fr / http://www.pharo.org 03 59 35 87 52 Assistant: Aurore Dalle FAX 03 59 57 78 50 TEL 03 59 35 86 16 S. Ducasse - Inria 40, avenue Halley, Parc Scientifique de la Haute Borne, BÃ¢t.A, Park Plaza Villeneuve d'Ascq 59650 France

June 14, 2021

Re: [ANN] Pharo-ODBC

by TomaÅ¾ Turk

Great, thank you! Best wishes, Tomaz

June 14, 2021

[ANN] Pharo-ODBC

by John Aspinall

There is now an ODBC framework for Pharo, available at the pharo-rdbms github site: https://github.com/pharo-rdbms/Pharo-ODBC <https://github.com/pharo-rdbms/Pharo-ODBC> This is based on the Dolphin Smalltalk Database Connection ODBC framework. Provided a suitable driver manager is installed this should work on MacOS and Linux in addition to Windows. Thanks to InfOil for supporting the development, to Torsten for tidying up and hosting the code, and Andy and Blair (Dolphin developers) for the original framework. Regards, John Aspinall

June 14, 2021

Re: New Pharo-based commercial software

by Noury Bouraqadi

Thank you all for the nice words and the support. Noury On Jun 14 2021, at 9:38 am, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > Congratulations. This is a really good concept, and it looks nice as well. > > > On 12 Jun 2021, at 11:36, Noury Bouraqadi <bouraqadi(a)gmail.com> wrote: > > > > Hi everyone, > > > > I'm glad to announce a new Pharo-based commercial product: PLC3000 (https://plc3000.com) > > > > It's a SaaS solution for teaching PLC programming for factory automation. The server side is based on Zinc and the client side uses PharoJS. > > > > This wouldn't have been possible without the great work done by the community in large, and more specifically, the Pharo consortium. > > > > Thank you all, > > Noury >

June 14, 2021

Re: New Pharo-based commercial software

by Noury Bouraqadi

It's for university undergraduate programs. Noury On Jun 14 2021, at 8:40 am, Petter <petter.egesund(a)gmail.com> wrote: > Hi, and congratulations - the product looks really cool! > > Which school age are the tasks made for? > Petter > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >

June 14, 2021

Re: New Pharo-based commercial software

by Sven Van Caekenberghe

Congratulations. This is a really good concept, and it looks nice as well. > On 12 Jun 2021, at 11:36, Noury Bouraqadi <bouraqadi(a)gmail.com> wrote: > > Hi everyone, > > I'm glad to announce a new Pharo-based commercial product: PLC3000 (https://plc3000.com) > > It's a SaaS solution for teaching PLC programming for factory automation. The server side is based on Zinc and the client side uses PharoJS. > > This wouldn't have been possible without the great work done by the community in large, and more specifically, the Pharo consortium. > > Thank you all, > Noury

June 14, 2021

Re: New Pharo-based commercial software

by Petter

Hi, and congratulations - the product looks really cool! Which school age are the tasks made for? Petter -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

June 14, 2021