April 2014 - Pharo-users - lists.pharo.org

Question on style

by nacho

I'm writing a little app to calculate the roots of quadratic equations. The first step is to build the model and then I would like to link this model with a Spec GUI. So far the model is almost done (I have to solve yet imaginary roots). Would you consider this good code? Would you change something? or re-arrange the code? This is what I have so far: "The idea is to have a class to calculate quadratic equations. This first draft only calculates real roots (leaving aside imaginary roots). A QuadraticEquation is a class used to solve Quadratic Equations of the form: ax^2 + bx + c = 0, where a is not 0. You can set the coefficients one by one using: self quadraticCoefficient: aNumber self linearCoefficient: aNumber self constant: aNumber." Object subclass: #QuadraticEquation instanceVariableNames: 'quadraticCoefficient linearCoefficient constant checkTerm root1 root2' classVariableNames: '' category: 'IS-Math' "I create the accessors and then the following methods" QuadraticEquation>>calculateRoots checkTerm := ((linearCoefficient squared) - ( 4 * quadraticCoefficient * constant)) . self checkNegativeSqrt. QuadraticEquation>>checkNegativeSqrt self checkTerm >= 0 ifTrue: [ root1 := ((linearCoefficient negated) + (checkTerm sqrt)) / (2 * quadraticCoefficient). root2 := ((linearCoefficient negated) - (checkTerm sqrt)) / (2 * quadraticCoefficient) ] ifFalse: [ ^ 'Error: Negative square root']. "Example: -3x^2+2x+2=0 root1 = -0.5485837703548636 root2 = 1.2152504370215302 print(it) | anEquation | anEquation := QuadraticEquation new. anEquation quadraticCoefficient: -3. anEquation linearCoefficient: 2. anEquation constant: 2. anEquation calculateRoots. anEquation root1. Then change the last line to 'anEquation root2' to get the other root." Thanks so much for the input. Best regards Nacho ----- Nacho Smalltalker apprentice. Buenos Aires, Argentina. -- View this message in context: http://forum.world.st/Question-on-style-tp4752165.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

April 2, 2014

Re: [Pharo-users] 64 bit version

by phil＠highoctane.be

How would that work? Would this be a 32 bit Object memory and engine compiled in 64bit mode? How is the code amended to make that possible? Is there a source tree somewhere? There are "int"s all over the place, so, how do we handle this? For the Slang part it appears doable. For the support code, especially Windows, it looks harder. TIA Phil Le 2 avr. 2014 01:07, "ClÃ©ment Bera" <bera.clement(a)gmail.com> a Ã©crit : > Hey, > > For 64 bits Spur is a big step forward. For Christmas you should have at > least the stack VM in 64bits. The JIT may take a bit longer to port. > Esteban and Eliot will work on that starting from May. > > There's also the solution to compile the VM in 64bits with a 32bits > runtime (I think FFI does not work, but the VM works in 64bits environment, > as gettimothy posted on vm-dev). > > > 2014-03-29 13:18 GMT-07:00 Pharo4Stef <pharo4Stef(a)free.fr>: > >> >> On 29 Mar 2014, at 21:16, Roelof Wobben <r.wobben(a)home.nl> wrote: >> >> > Pharo4Stef schreef op 29-3-2014 21:07: >> >> >> >> >> >>> Pity. >> >> >> >> You know there is no magic powder. We are already really grateful that >> eliot is pushing the vm work. >> >> Esteban will help on the 64 bits and clement probably too or spur and >> new bytecodes plus language side optimisations. If we could pay 3 full time >> engineers in the future... but this is not the case. >> >> >> > >> > I know that and it's not that i think the developer do a bad job. >> > It's more a expresiion of my feeling. >> >> Ok then I share the same feeling :) >> >> > >> > Roelof >> > >> >> >> >

April 2, 2014

Re: [Pharo-users] Rewiting code: doc?

by Paul DeBruicker

I'm not sure how it works in modern Pharos as I think the class names were changed from Pharo 2.0 but in 1.4 you could do this to rename packages: ORCategoryRegexRefactoring new replace: '^XXX-(.*)$' with: 'ZZZ-$1' ignoreCase: false; yourself and this for renaming classes: ORClassRegexRefactoring new "Example 1: Change class prefixes" renameClasses; replace: '^XXX(.*)$' with: 'ZZZ$1' ignoreCase: false; yourself. Hope this helps Paul philippeback wrote > Hello, > > I'd like to get code rewritten automatically for a number of packages and > classes. > > Basically I've got a bunch of packages and classes starting with a given > prefix (like XXXThis and XXXThat) and I'd like to get them to be ZZZThis > and ZZZThat. > > Of course, I want all the source code to follow suit. > > I saw the option in the Nautilus menu, but that's quite obscure. > > I googled around and read the Flamel thing in the book but that didn't > helped me. > > Clues? > > Phil -- View this message in context: http://forum.world.st/Rewiting-code-doc-tp4752146p4752162.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

April 2, 2014

deep into pharo(esug 2013) translate to korean draft version.

by peter yoo

http://trans.onionmixer.net/mediawiki/index.php?title=DeepintoPharo this book translate to korean. but draft now. have a time then read and fix more. thanks for Alexandre Bergel, Damien Cassou, Stephane Ducasse, Jannik Laval..... and more smalltalkers. :D -- http://onionmixer.net | http://gentoo-kr.org peter yoo. ROK

April 2, 2014

Re: [Pharo-users] 64 bit version

by ClÃ©ment Bera

Hey, For 64 bits Spur is a big step forward. For Christmas you should have at least the stack VM in 64bits. The JIT may take a bit longer to port. Esteban and Eliot will work on that starting from May. There's also the solution to compile the VM in 64bits with a 32bits runtime (I think FFI does not work, but the VM works in 64bits environment, as gettimothy posted on vm-dev). 2014-03-29 13:18 GMT-07:00 Pharo4Stef <pharo4Stef(a)free.fr>: > > On 29 Mar 2014, at 21:16, Roelof Wobben <r.wobben(a)home.nl> wrote: > > > Pharo4Stef schreef op 29-3-2014 21:07: > >> > >> > >>> Pity. > >> > >> You know there is no magic powder. We are already really grateful that > eliot is pushing the vm work. > >> Esteban will help on the 64 bits and clement probably too or spur and > new bytecodes plus language side optimisations. If we could pay 3 full time > engineers in the future... but this is not the case. > >> > > > > I know that and it's not that i think the developer do a bad job. > > It's more a expresiion of my feeling. > > Ok then I share the same feeling :) > > > > > Roelof > > > > >

April 1, 2014

Re: [Pharo-users] lasergame question

by Ben Coman

Roelof Wobben wrote: > Mark Rizun schreef op 1-4-2014 18:12: >> Hello, Roelof! >> >> Stef is partly right. I had implemented Laser Game but on Squeak, not >> Pharo. >> If you have any questions, ask me and I will try to help you. >> >> Mark > > First question : > > I had a working test. I saved it to my hard disk. > Closed Pharo . re open it and the test is failing. > > Roelof > > > That is a very generic statement, and my very generic answer is that I've never observed that happening. You would need to present more specific context for your problem. * What is the error * What is the method source and line that it is failing on * What are the values of the instance variables This is generally described in the following article. http://www.catb.org/esr/faqs/smart-questions.html cheers -ben

April 1, 2014

Rewiting code: doc?

by phil＠highoctane.be

Hello, I'd like to get code rewritten automatically for a number of packages and classes. Basically I've got a bunch of packages and classes starting with a given prefix (like XXXThis and XXXThat) and I'd like to get them to be ZZZThis and ZZZThat. Of course, I want all the source code to follow suit. I saw the option in the Nautilus menu, but that's quite obscure. I googled around and read the Flamel thing in the book but that didn't helped me. Clues? Phil

April 1, 2014

Re: [Pharo-users] lasergame question

by Roelof Wobben

Mark Rizun schreef op 1-4-2014 18:12: > Hello, Roelof! > > Stef is partly right. I had implemented Laser Game but on Squeak, not > Pharo. > If you have any questions, ask me and I will try to help you. > > Mark First question : I had a working test. I saved it to my hard disk. Closed Pharo . re open it and the test is failing. Roelof

April 1, 2014

Re: [Pharo-users] lasergame question

by Mark Rizun

Hello, Roelof! Stef is partly right. I had implemented Laser Game but on Squeak, not Pharo. If you have any questions, ask me and I will try to help you. Mark

April 1, 2014

Re: [Pharo-users] create instance var accesors from menu (Pharo 3.0)

by Ben Coman

Roelof Wobben wrote: > Hello, > > On squeeze 3.9 you can make them with a menu. Yes. You missed that since you couldn't compare your result with the exact screenshot available in the tutorial. > > Is there a simular way I can do the same in Pharo 3.0 ? > > Roelof > > . I haven't used that in a very long time - I had thought it had been removed - but when I look I find you can... Right-click on YourClass > Refactoring > Class Refactoring > Generate Accessors. Thanks for asking. I learnt something new today. I hope you'll continue with the Squeak 3.9 image for the tutorial. Otherwise the advice we give to your questions will end up being frustrating to all. cheers -ben

April 1, 2014