February 2011 - Pharo-users

rounding errors

by t olschewski

Hi, using formatted number output recently I got the following output: 1.0 printPaddedWith: $0 to: 2.1. "'01.0'" 1.0 printPaddedWith: $0 to: 2.2. "'01.00'" 1.0 printPaddedWith: $0 to: 2.3. "'01.00'" <-- wrong 1.0 printPaddedWith: $0 to: 2.4. "'01.000'" <-- wrong 1.0 printPaddedWith: $0 to: 2.5. "'01.00000'" running Float>>printPaddedWith:to: in the debugger showed me that the reason of this odd behaviour seems to be produced by Float>>truncated and/or Float>>fractionPart. I can provoke errors of that kind even easier: (2.3 fractionPart * 10) truncated. => "2" (instead of 3) In Primitive 51 (primitiveTruncated for Float>>truncated) I read frac = modf(rcvr, &trunc); so the problem looks like an issue with rounding errors in Math-Library's modf function. Indeed, I can reproduce the odd result of "(2.3 fractionPart * 10) truncated." in C++ using modf: // g++ -lm truncate.cpp && ./a.out #include<iostream> #include<cmath> using namespace std; int main(){ double f1, f2, f3; modf(10 * 0.3, &f1); cout << f1 << endl; modf(10 * modf(2.3, &f2), &f3); cout << f3 << endl; } // output: // 3 (ok) // 2 (error - should be 3) Question: what can be done about this? As a matter of fact, several important methods spread over a number of classes (Float, Number, Morph ... being among them) are senders of Float>>truncated or Float>>fractionPart, so rounding errors in primitive 51 or 52 could provoke unexpected behaviour in surprising places. -- View this message in context: http://forum.world.st/rounding-errors-tp3327130p3327130.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Feb. 27, 2011

Re: [Pharo-users] SimpleWebDoc question

by laurent laffont

Hi Marco, I've put the working image here: http://lolgzs.free.fr/pharo/simplewebdoc.zip Note it uses Pharo pre-1.0 and Seaside 2.8. The nice url http://localhost:8080/Collections is handled by SWDocView>>initialRequest: I don't know if it works with Seaside 3. I haven't looked back at SimpleWebDoc for more than one year, and I've written it to learn so it's hacky. No problem to post future questions, but I think that posting on pharo-users list is even better (I read it). And thanks to look at this project. Cheers, Laurent. On Sun, Feb 27, 2011 at 6:13 PM, Marco A. Gonzalez <marcoinc(a)mac.com> wrote: > Laurent, > > First, thank you for your postings on Smalltalk. I've been bitten by the > smalltalk bug and am trying to convert from Java to smalltalk, and your > postings have helped. So... I guess I'm still a newbie... asking for help... > > So... I found that you mentioned SimpleWebDoc ( > http://www.squeaksource.com/SimpleWebDoc.html) in a posting > http://forum.world.st/Pharo-Sources-Google-Hit-Ratio-td3318289.html but it > didn't seem appropriate to post there a "newbie" message regarding how to > get SimpleWebDoc to work so please excuse me for writing directly to you. > > I loaded SimpleWebDoc into my Pharo 1.1 image via Monticello, but when I > point my browser to http://localhost:8080/view-doc and click on a package > name, say "Collections" which links to http://localhost:8080/Collections, > I get the following error: > > /Collections not found > > which I assume is because Seaside doesn't have a "Collections" entry in the > config. So, I don't know what I don't know in order to get it working how I > assume you expected it to work. Would you give me some direction? > > Finally, please let me know where I might post future questions like this > one so that others can learn from my questions and your answers. > > Thanks again for your contributions, > > - Marco A > > ------------------------------------------------------ > Marco A. Gonzalez, President > Amagavi, Inc. > Developer of database-driven web sites > > web: http://www.amagavi.com/ > email on iPhone: marcoinc(a)mac.com > cell: 202-222-5137 > > > > >

Feb. 27, 2011

Monticello: how to update package-cache listing?

by DougEdmunds

I deleted a mcz file manually from the package-cache directory (outside of Pharo), but when I go into the package-cache repository, through Monticello, the deleted file still appears on the list for that package. What code do I run to refresh the listing of the contents of the package-cache repository for Monticello? -- View this message in context: http://forum.world.st/Monticello-how-to-update-package-cache-listing-tp3325… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Feb. 25, 2011

Re: [Pharo-users] Package browser?

by Miguel CobÃ¡

+1 El vie, 25-02-2011 a las 15:25 +0100, laurent laffont escribiÃ³: > > On Fri, Feb 25, 2011 at 12:36 PM, StÃ©phane Ducasse > <stephane.ducasse(a)inria.fr> wrote: > > The latest PDF download is dated 2009-10-28. I would be > very happy to > > purchase a book that was updated. > > > We did not change that much since them. > I'm working on the next book > - exception > - setting > - metacello > - ... > - and we need more: openDBX :) > > > Either through and autobuild or one > > of the writers could once a month publish a manual build. > > > Normally if you checkout the git version it should work out of > the box. > > > > > Hey, why not put this on the Hudson server ? The last PBE version in > one click :) > > > Laurent > > > > > > > I spent in total a day trying top get a Laytex environ > working on my Mac. > > > really? > Just download the tex installer and after you latex pbe.tex > and it works. > You should ask us because most of us works with latex on mac > or linux. > > > I couldn't get the book to build and it left me tons of > stuff installed > > without a clear way to remove. > > I do understand you are trying to balance having the book > open and > > still make some cash. > > > Not even :) > We earn so little. We are just focused on the next book. > > > Maybe you should jside more with making some > > cash. The barrier to building the boook on your own is > high. Just go > > ahead and strike a deal with one of the book vendors that > will manage > > this for you. Pragmatic Programmers has a great beta books > system. > > > > I prefer to die than to have to deal with these people. The > last experience > was so painful. I better prefer to stay poor :) > > > Having more recent copies in more hands my push the book dev > faster too. > > > The first book is an intro to smalltalk so it does not change > a lot in latest pharo1.3. > What we could do is to include the pdf (if this is not ready) > in the git repo and linked it from > the web site. > > Stef > > > > thanks, Jon > > > > > > On Thu, Feb 24, 2011 at 4:40 AM, Norbert Hartl > <norbert(a)hartl.name> wrote: > >> > >> On 23.02.2011, at 15:22, Rob Vens wrote: > >> > >>> I am attempting to do the Pharo by Example book, but a > package browser (which is used in the examples) is not in the > 1.1.1 or 1.2 image. > >>> Should I still use categories? If I create a package in > Monticello browser I am not able to add classes or anything > (not as far as I could see). > >>> Just starting out using Pharo, so apologies if these > questions are already answered elsewhere. > >> > >> Like Miguel said you should use the image from the website. > As you could see on the website a second edition of the book > is in the make. I would advize you to start with the current > book. It gets you going in using smalltalk and pharo. After > that the second edition will be available. Quite some things > will have changed then but nothing fundamental regarding > smalltalk. It could be nice for you to follow the evolution if > you start from the first image and you get the feel how it > gets better. You will be one of the guys that have a fresh > look on all of this. That is one thing we all are missing > because we are working quite some time with it and we are > blind to certain things. So don't hesitat to ask questions or > the complain about things you think are stupid :) > >> > >> Norbert > >> > > > > > > -- Miguel CobÃ¡ http://twitter.com/MiguelCobaMtz http://miguel.leugim.com.mx

Feb. 25, 2011

Re: [Pharo-users] Package browser?

by laurent laffont

On Fri, Feb 25, 2011 at 12:36 PM, StÃ©phane Ducasse < stephane.ducasse(a)inria.fr> wrote: > > The latest PDF download is dated 2009-10-28. I would be very happy to > > purchase a book that was updated. > > We did not change that much since them. > I'm working on the next book > - exception > - setting > - metacello > - ... > - and we need more: openDBX :) > > > Either through and autobuild or one > > of the writers could once a month publish a manual build. > > Normally if you checkout the git version it should work out of the box. > Hey, why not put this on the Hudson server ? The last PBE version in one click :) Laurent > > > > I spent in total a day trying top get a Laytex environ working on my > Mac. > > really? > Just download the tex installer and after you latex pbe.tex and it works. > You should ask us because most of us works with latex on mac or linux. > > > I couldn't get the book to build and it left me tons of stuff installed > > without a clear way to remove. > > I do understand you are trying to balance having the book open and > > still make some cash. > > Not even :) > We earn so little. We are just focused on the next book. > > > Maybe you should jside more with making some > > cash. The barrier to building the boook on your own is high. Just go > > ahead and strike a deal with one of the book vendors that will manage > > this for you. Pragmatic Programmers has a great beta books system. > > > I prefer to die than to have to deal with these people. The last experience > was so painful. I better prefer to stay poor :) > > > Having more recent copies in more hands my push the book dev faster too. > > The first book is an intro to smalltalk so it does not change a lot in > latest pharo1.3. > What we could do is to include the pdf (if this is not ready) in the git > repo and linked it from > the web site. > > Stef > > > thanks, Jon > > > > > > On Thu, Feb 24, 2011 at 4:40 AM, Norbert Hartl <norbert(a)hartl.name> > wrote: > >> > >> On 23.02.2011, at 15:22, Rob Vens wrote: > >> > >>> I am attempting to do the Pharo by Example book, but a package browser > (which is used in the examples) is not in the 1.1.1 or 1.2 image. > >>> Should I still use categories? If I create a package in Monticello > browser I am not able to add classes or anything (not as far as I could > see). > >>> Just starting out using Pharo, so apologies if these questions are > already answered elsewhere. > >> > >> Like Miguel said you should use the image from the website. As you could > see on the website a second edition of the book is in the make. I would > advize you to start with the current book. It gets you going in using > smalltalk and pharo. After that the second edition will be available. Quite > some things will have changed then but nothing fundamental regarding > smalltalk. It could be nice for you to follow the evolution if you start > from the first image and you get the feel how it gets better. You will be > one of the guys that have a fresh look on all of this. That is one thing we > all are missing because we are working quite some time with it and we are > blind to certain things. So don't hesitat to ask questions or the complain > about things you think are stupid :) > >> > >> Norbert > >> > > > > >

Feb. 25, 2011

Re: [Pharo-users] plot

by StÃ©phane Ducasse

:) I always have problem with left and right :) Stef >> you have MorphPlot probably on squeaksource. > > hi StÃ©phane, > that does indeed what i wanted to do, thanks. btw it was not too easy <grin> to find, but using PlotMorph instead of MorphPlot did finally do the trick. > thanks again > werner

Feb. 25, 2011

Re: [Pharo-users] Package browser?

by StÃ©phane Ducasse

> The latest PDF download is dated 2009-10-28. I would be very happy to > purchase a book that was updated. We did not change that much since them. I'm working on the next book - exception - setting - metacello - ... - and we need more: openDBX :) > Either through and autobuild or one > of the writers could once a month publish a manual build. Normally if you checkout the git version it should work out of the box. > I spent in total a day trying top get a Laytex environ working on my Mac. really? Just download the tex installer and after you latex pbe.tex and it works. You should ask us because most of us works with latex on mac or linux. > I couldn't get the book to build and it left me tons of stuff installed > without a clear way to remove. > I do understand you are trying to balance having the book open and > still make some cash. Not even :) We earn so little. We are just focused on the next book. > Maybe you should jside more with making some > cash. The barrier to building the boook on your own is high. Just go > ahead and strike a deal with one of the book vendors that will manage > this for you. Pragmatic Programmers has a great beta books system. I prefer to die than to have to deal with these people. The last experience was so painful. I better prefer to stay poor :) > Having more recent copies in more hands my push the book dev faster too. The first book is an intro to smalltalk so it does not change a lot in latest pharo1.3. What we could do is to include the pdf (if this is not ready) in the git repo and linked it from the web site. Stef > thanks, Jon > > > On Thu, Feb 24, 2011 at 4:40 AM, Norbert Hartl <norbert(a)hartl.name> wrote: >> >> On 23.02.2011, at 15:22, Rob Vens wrote: >> >>> I am attempting to do the Pharo by Example book, but a package browser (which is used in the examples) is not in the 1.1.1 or 1.2 image. >>> Should I still use categories? If I create a package in Monticello browser I am not able to add classes or anything (not as far as I could see). >>> Just starting out using Pharo, so apologies if these questions are already answered elsewhere. >> >> Like Miguel said you should use the image from the website. As you could see on the website a second edition of the book is in the make. I would advize you to start with the current book. It gets you going in using smalltalk and pharo. After that the second edition will be available. Quite some things will have changed then but nothing fundamental regarding smalltalk. It could be nice for you to follow the evolution if you start from the first image and you get the feel how it gets better. You will be one of the guys that have a fresh look on all of this. That is one thing we all are missing because we are working quite some time with it and we are blind to certain things. So don't hesitat to ask questions or the complain about things you think are stupid :) >> >> Norbert >> >

Feb. 25, 2011

Re: [Pharo-users] Provided packages from Metacello project configuration

by Mariano Martinez Peck

On Fri, Feb 25, 2011 at 8:48 AM, Panu Suominen <panu.j.m.suominen(a)gmail.com>wrote: > This is probably wrong mailing list for this question... > I cc'ed metacello and dale :) > Is there a way to define what categories/packages/classes are provided > by the given configuration? For example > > ConfigurationOfXXX project latestVersion providedPackages > > This would not include the packages that are required by the > project and are actually provided by other configurations/projects. > > If there is a way to produce this kind of package list > it would help implementing CI-testing. Testing script would > not have to explicitly list what packages to test but could refer > to the project definition. Currently one has to alter > the testing script every time the packages are changed. > With this kind of information one could implement project > CI-builds with something like this: > whatToBuild := ConfigurationOfXXX project lastVersion. > whatToBuild load. > HDTestReport runPackages: whatToBuild providedPackages. > HDLintReport runPackages: whatToBuild providedPackages. > > And then it would be easy to build custom Job plugin to Jenkins that > would simply ask about the name and the location of ConfigurationOfXXX. > > -- > Panu > >

Feb. 25, 2011

Provided packages from Metacello project configuration

by Panu Suominen

This is probably wrong mailing list for this question... Is there a way to define what categories/packages/classes are provided by the given configuration? For example ConfigurationOfXXX project latestVersion providedPackages This would not include the packages that are required by the project and are actually provided by other configurations/projects. If there is a way to produce this kind of package list it would help implementing CI-testing. Testing script would not have to explicitly list what packages to test but could refer to the project definition. Currently one has to alter the testing script every time the packages are changed. With this kind of information one could implement project CI-builds with something like this: whatToBuild := ConfigurationOfXXX project lastVersion. whatToBuild load. HDTestReport runPackages: whatToBuild providedPackages. HDLintReport runPackages: whatToBuild providedPackages. And then it would be easy to build custom Job plugin to Jenkins that would simply ask about the name and the location of ConfigurationOfXXX. -- Panu

Feb. 25, 2011

Re: [Pharo-users] plot

by Werner Kassens

> you have MorphPlot probably on squeaksource. hi StÃ©phane, that does indeed what i wanted to do, thanks. btw it was not too easy <grin> to find, but using PlotMorph instead of MorphPlot did finally do the trick. thanks again werner

Feb. 24, 2011