- Pharo-users - lists.pharo.org

Floating point arithmetic
by Donald Howard Jan. 15, 2020

Jan. 15, 2020

Hello everyone, This is an issue I've had awareness of going way back but it's the first time I've had to personally deal with it. I've done some research and found it addressed in a number of ways but given current time pressures and a huge list of to-dos, I thought I'd turn to the community for rapid advice to get me over the hump. The circumstances are summarized below in code and comments suitable for a playground. "This is the actual arithmetic I want to do... 0.09560268 - 0.005 = 0.09060268" "Evaluate this in a playground and you'll see this is what floating point arithmetic produces --the first two are wrong, every one after is correct" 0.09560268 - 0.005 "=> 0.09060267999999999". 0.0956026 - 0.005 "=> 0.09060259999999999". 0.095602 - 0.005 "=> 0.090602". 0.09560 - 0.005 "=> 0.0906". 0.0956 - 0.005 "=> 0.0906". 0.095 - 0.005 "=> 0.09". "This workaround works" 0.09560268 - 0.005 roundTo: 0.00000001 "=> 0.09060268". "but one has to compute number of digits of precision and according to study above, it's not necessary at precisions >= 0.000001" "What are other suggestions, workarounds or approaches community has?" "THANKS!" Don Howard <https://objectguild.com> *Founding Member* dhoward(a)objectguild.com +31653139744 (US) 651-253-7024

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Smalltalk meetup in Palo Alto, CA on January 25, 2020
by Alexandre Bergel Jan. 15, 2020

Jan. 15, 2020

Dear Friends and Colleagues, We are organizing a Smalltalk meetup in Palo Alto, CA, on Saturday 25 January, 2020. The event is free, thanks to Lam Research, Object Profile, Semantics for sponsoring the event. More information may be found on https://agileartificialintelligence.github.io/meetup.html People who wish to attend, then the webpage contains the registration links. Please, join! Kind regards, Alexandre & Juan Pablo -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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Pharo Quality Rules for Beginners
by ESTEBAN VILLALOBOS DIAZ Jan. 15, 2020

Jan. 15, 2020

Hello everyone! My name is Esteban and I will be working on the Pharo Quality Rules for the next few months. The goal is to create different profiles for the rules according to the programming experience of the user. For example, for the beginner profile we would like to check for common mistakes made by people who are just starting with Pharo like: - Sending self as a message (probably because they forgot a . ) - Using False instead of false - etc.. I would appreciate it if you could share with me other common mistakes that you have seen beginners do, or maybe tell me a bit of your own experience when you started using Pharo :) Best, Esteban Villalobos

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Grafoscopio accepted at FOSDEM :-)... Now looking for travel funds :-/
by Offray Vladimir Luna CÃ¡rdenas Jan. 14, 2020

Jan. 14, 2020

Hi, The subject pretty much resumes the current situation: organizers at FOSDEM[1] approved my talk about Grafoscopio for the 2020 version (Feb 1 and 2). They tell me that they don't provide travel funds, but because I spoke about the voluntary and self funded nature of the project and asked for travel funds, the usual route here is trying to find an entity, located in Brussels that would be interested in some workshops about the tool and that will cover travel expenses. Ideally such entity would be related with the subjects and themes we have been working with the Grafoscopio community: civic tech, hacktivism, reproducible research, data journalism, data feminism, critical science and technology studies, open data, collective writing self publishing and book sprints. As you can see, Grafoscopio and its community are pretty versatile and diverse in their concerns and approaches, so I hope that opens possibilities for a lot of interested sponsors, located in Brussels. Even sponsors in Europe could work, as internal travel is kind of cheap and the biggest part of the expenses are inter continental travel. I don't know of any particular European entity that could sponsor my travel funds for FOSDEM, but hopefully the European pharoers know of some. The FOSDEM organizers asked me for some possible entities so, I'm all ears :-) Santiago and Phill, any particular ideas? If not, remember that we can prepare a remote talk :-) [1] https://fosdem.org/2020/ Thanks, Offray

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Pharo on OpenSUSE (FFI / libgit2 errors)
by Jan BlizniÄenko Jan. 14, 2020

Jan. 14, 2020

Hello I would like to use Pharo on OpenSUSE, which is only Linux distro on our university PCs, however, I am getting FFI to libgit2 related errors just about everywhere. By starting Launcher itself, by starting an image (Pharo 7 and 8) and fetching probably any repository (tried Roassal 2 on Pharo 6, 7, 8). I would really like to be able to use Pharo on university PCs, but I need you help with finding out what might be wrong and what to do about it. The main and only instruction for Linux is currently "Unzip the archive in a place where you have write privileges.", which obviously does not work for OpenSUSE. It works fine for Ubuntu and Debian. Thank you Jan

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[ANN] Embedding Image Example (Win)
by tesonep＠gmail.com Jan. 13, 2020

Jan. 13, 2020

Hi, I have produced an example of using the headless VM to have an embedded image in Windows. The example is hosted in Github (https://github.com/tesonep/pharo-vm-embedded-example) The example is a CMake project to generate a new small executable that uses the VM as a library. Also, it shows how to perform the branding of applications (I have used the same Pharo icon, but we can use anything else). In the example, I am opening one of the SDL2 examples, it opens a window where we can draw in an Athens Canvas. It requires a Cygwin environment, but if you are able to build the headless VM you already have it!. I will do other examples of the use case we are thinking for the headless VM! Cheers, Pablo -- Pablo Tesone. tesonep(a)gmail.com

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Why Smalltalk is so easy to evangelize
by Richard Kenneth Eng Jan. 13, 2020

Jan. 13, 2020

https://itnext.io/why-smalltalk-is-so-easy-to-evangelize-2b88b4d4605c

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TechTalks: Dates + Call
by Marcus Denker Jan. 10, 2020

Jan. 10, 2020

Hi, Here are dates for the Pharo TechTalks first half of 2020: January 23: https://association.pharo.org/event-3697009 Thursday 20 https://association.pharo.org/event-3697011 March 19 https://association.pharo.org/event-3697012 April 23 https://association.pharo.org/event-3697013 May 28 https://association.pharo.org/event-3697016 June 18 https://association.pharo.org/event-3697017 We need topics! If you want to take over one of these talks to show your project (or something that you find interesting) â> send me a mail. The date/time can be changed as needed, too. Archive of past techtalks: https://pharo.org/TechTalk

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Re: [Pharo-users] is this better regarding naming thigs
by Richard O'Keefe Jan. 8, 2020

Jan. 8, 2020

What is the receiver? There are two and only two relevant objects: the word and the collection. aCollection selectAnagramsOf: aString aString anagramsIn: aCollection would be good names. In a language that did not let you extend system classes, anagrams(of: aString, in: aCollection) would be good, but Smalltalk is not such a language. 'findAnagramsCandidates:subject:' is intention-revealing, but is not good English. Well, maybe the intentions could be revealed a bit better. What is the subject of an anagram? No idea. What is an 'anagramsCandidate'? No idea. What is the difference between an 'anagram' and an 'anagramCandidate'? <whatever> anagramsOf: aString in: aCollection <whatever> selectFrom: aCollection anagramsOf: aString On Mon, 6 Jan 2020 at 03:07, Roelof Wobben via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > Hello > > In a earlier question I get a remark to think better about naming things. > Now I did a challene where I have to find anagrams of a given word in a > collection, > > So I did this : > > findAnagramsCandidates: aCollection subject: aWord > | charBag | > charBag := aWord asLowercase asBag. > ^ aCollection > reject: > [ :word | (word sameAs: aWord) or: [ word asLowercase asBag > ~= charBag ] ] > > > is my naming here better or can i improved and if so how ? > > Regards, > > Roelof > >

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JOB: Smalltalkers in Barcelona
by Esteban Lorenzano Jan. 8, 2020

Jan. 8, 2020

Hello Pharoers Please distribute aroundâ¦. Lifeware is looking for smart people and Smalltalkers for positions at Barcelona. If you are interested please contact Massimo Arnoldi <massimo.arnoldi(a)lifeware.ch <mailto:massimo.arnoldi@lifeware.ch>> Esteban

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