Beginners August 2008

beginners@lists.squeakfoundation.org

60 participants
58 discussions

Monticello storage model
by Anders Janmyr 25 Aug '08

25 Aug '08

Hi, Is Monticello storing a complete snapshot everytime it is saved? If so is this not a potential performance problem? Thanks for any info or pointers to more information. Anders -- http://anders.janmyr.com/

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The Bridge Playing example
by Andy Burnett 25 Aug '08

25 Aug '08

<< Todd said: A deck, hand, pile, all can be implemented as just an OrderedCollection. You might start with a Deal or BridgeRound or something. It might have some methods like: initialize | hands deck | deck := Card bridgeDeck shuffled asOrderedCollection. "just like english" north := OrderedCollection new. south := OrderedCollection new. east := OrderedCollection new. west := OrderedCollection new. trick := OrderedCollection new. -- snip -- >> Todd, thanks for writing that up. I found it really interesting to see how you tackled the problem. I think it would be great if - as time permits - the experts of the list could take a problem - nice simple ones would be good, and show how you might solve it. It is also very interesting to see how you refine/modify each others' solutions. cheers AB

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Squeak + VirtualHost + KomHTTP
by Herve Darce 25 Aug '08

25 Aug '08

Hi, I want to use the virtual hosting. The package ModVhost can do that. Also, I shutdown apache and I do use only squeak. I shutdown all services. "HttpService allInstancesDo: [:each | each stop. each unregister]." Then, I open on my pc two virtualhosts: localhost and mymachine. ma := ModuleAssembly core. ma virtualHost: 'localhost' do: [ma addPlug: [ :request | HttpResponse fromString: 'You are seeing content for localhost']]. ma virtualHost: 'mymachine' do: [ma addPlug: [ :request | HttpResponse fromString: 'You are seeing content for mymachine']]. ma addPlug: [ :request | HttpResponse fromString: 'You are seeing default content for other']. (HttpService startOn: 8080 named: 'Example') module: ma rootModule. I get the same page 'You are seeing default content for other' for three cases: * http://localhost:8080 * http://mymachine:8080 * http://127.0.0.1 I had to get three different pages: * 'You are seeing content for localhost' for http://localhost:8080 * 'You are seeing content for mymachine' for http://mymachine:8080 * 'You are seeing default content for other' for http://127.0.0.1 I do not understand. Cheers Herve Darce

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Smalltalk is a Mystery to Me
by Tcykgreis＠aol.com 23 Aug '08

23 Aug '08

I have had a curiosity about Smalltalk for many years so I recently downloaded and installed Squeak. That's when the trouble began. I have written applications that deal bridge hands and either display the hands on screen or save them in a couple of different formats. I originally wrote the 'words' in Forth. I later tried Ruby and rewrote most of the programs in Ruby. I did it as a learning experience. I sat out to do the same thing in Squeak, again as a learning experience, but have made virtually no progress. I create the class 'Bridge' with the subclass of dealer. I try to initialize by filling a byteArray with 52 numbers, 0 through 51. I tended to create additional methods to shuffle and deal the cards to four more byte arrays named north, east, south, and west. Eventually I will need another method to "stack the deck." I will also need a counter to keep track of the deal number. I can't get started, and I mean zero progress, because I can't create and load deck. It seems like the documentation is never quit up to date. I read about curly braces and tried deck := {0. 1. 2. ... }. When I try to accept it, first deck is questioned and then after deck I get something about not expecting anything else. I know there is a word 'asByteArray:' and I assume a number would specify the size of the array but nowhere can I find anything about the order in which the information should be provided. I tried deck asByteArray: 52 but I don't know if it worked. If it did work, how do I load the bytes into it? How do I look at a byte in a particular location in the array? Can I remove a byte from position x and/or insert a byte at position y and everything moves to accommodate the change. In Forth and Ruby, I was able to store the hands as a 2D bit array, 4 suits and 13 bits. If the card was present the bit was set. When I dealt the cards, the appropriate bits were set.. This worked really well. The suits came out already sorted. The strength of a suit turned out to be related to the value stored for the suit. The number of cards in the suit could be found by counting set bits. I have yet to find bit-manipulating words in Squeak/Smalltalk. As an aside, the least number of bits that must be used to store a complete deal is 104 or 13 bytes. The bits are arranged in 52 2-bit groups. The position in the array represents the value of the card and the bits determine which hands gets the card represented by that position. When you shuffle the 2-bit groups must be kept in tact. I could easily do this in Forth but could not do it in Ruby. If you are going to save a few million hands, it is nice to be able to do so in this most compact form. If I could just figure out where to find the answers to these beginner question, I would really appreciate it. It would also be nice if I could see some examples of these methods. Charlie **************It's only a deal if it's where you want to go. Find your travel deal here. (http://information.travel.aol.com/deals?ncid=aoltrv00050000000047)

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UK Smalltalk website
by Giovanni Corriga 23 Aug '08

23 Aug '08

Hi all, the UK Smalltalk user group has now its own website (actually, a blog): http://www.uksmalltalk.org/ there you'll find announcements and news related to the UK Smalltalk scene: meetings, presentations, etc. Ciao, Giovanni

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Latex + Squeak
by Hervé Darce 23 Aug '08

23 Aug '08

Hi, I use the package Pier-Documentation. It allows me to write a Tex file (myfile.tex) Squeak can it to compile the Tex file to dvi or pdf (myfile.dvi or myfile.pdf)? Into Squeak, how can I launch a program external as latex, for example? Cheers Herve Darce

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Seaside site performance in 256MB
by Gian Holland 23 Aug '08

23 Aug '08

I understand there are a lot a factors that play in to this. But I have a general question how does seaside perform on a server with 256MB. Thinking about deploying it. Thanks

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Re: [Newbies] Smalltalk is a Mystery to Me
by Marcin Tustin 23 Aug '08

23 Aug '08

On Fri, Aug 22, 2008 at 1:30 AM, <Tcykgreis(a)aol.com> wrote: > I have had a curiosity about Smalltalk for many years so I recently > downloaded and installed Squeak. That's when the trouble began. I have > written applications that deal bridge hands and either display the hands on > screen or save them in a couple of different formats. I originally wrote the > 'words' in Forth. I later tried Ruby and rewrote most of the programs in > Ruby. I did it as a learning experience. I sat out to do the same thing in > Squeak, again as a learning experience, but have made virtually no progress. > I create the class 'Bridge' with the subclass of dealer. I try to initialize > by filling a byteArray with 52 numbers, 0 through 51. > Woah...what? This doesn't really make any sense. > I tended to create additional methods to shuffle and deal the cards to four > more byte arrays named north, east, south, and west. Eventually I will need > another method to "stack the deck." I will also need a counter to keep track > of the deal number. > > I can't get started, and I mean zero progress, because I can't create and > load deck. It seems like the documentation is never quit up to date. I read > about curly braces and tried deck := {0. 1. 2. ... }. When I try to accept > it, first deck is questioned and then after deck I get something about not > expecting anything else. > This is because deck is undeclared, and then because you have a syntax error. > I know there is a word 'asByteArray:' and I assume a number would specify > the size of the array but nowhere can I find anything about the order in > which the information should be provided. I tried deck asByteArray: 52 but I > don't know if it worked. If it did work, how do I load the bytes into it? > How do I look at a byte in a particular location in the array? Can I remove > a byte from position x and/or insert a byte at position y and everything > moves to accommodate the change. > First of all, are you familiar with the syntax? Squeak by example will help guide you through looking at classes, and seeing what methods they have etc. > > In Forth and Ruby, I was able to store the hands as a 2D bit array, 4 suits > and 13 bits. If the card was present the bit was set. When I dealt the > cards, the appropriate bits were set.. This worked really well. The suits > came out already sorted. The strength of a suit turned out to be related to > the value stored for the suit. The number of cards in the suit could be > found by counting set bits. I have yet to find bit-manipulating words in > Squeak/Smalltalk. > > As an aside, the least number of bits that must be used to store a complete > deal is 104 or 13 bytes. The bits are arranged in 52 2-bit groups. The > position in the array represents the value of the card and the bits > determine which hands gets the card represented by that position. When you > shuffle the 2-bit groups must be kept in tact. I could easily do this in > Forth but could not do it in Ruby. If you are going to save a few million > hands, it is nice to be able to do so in this most compact form. > > If I could just figure out where to find the answers to these beginner > question, I would really appreciate it. It would also be nice if I could see > some examples of these methods. > > Charlie > > I would recommend that you create a card class, with a member variable that represents the suit (probably as a symbol) and a second member variable that represents the card in the suit. Create a class method that returns new instances (eventually have it throw an exception if something out of the range of what is acceptable is created) and have a second class method that creates a collection of cards that contains all the cards, in order. You can use the methods on the appropriate collection to shuffle it. Once you've built something working on that, you can try to optimise storage, either on disk or in memory. > > > > ------------------------------ > It's only a deal if it's where *you* want to go. Find your travel deal * > here* <http://information.travel.aol.com/deals?ncid=aoltrv00050000000047>. > > _______________________________________________ > Beginners mailing list > Beginners(a)lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners > >

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Re: Impact of Squeak installation on OS-X
by Stephen Ng 22 Aug '08

22 Aug '08

Hi! everyone, Thanks for the swift replies. I will attempt to fix the problem as suggested by Tim. You are right Bert, it is possible to change to another default app but to remove a default app entirely?!! I suppose its in some .plist somewhere on the system. The question is which. Anyone out there know? Stephen

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Re: [Newbies] accented characters + squeak
by Hervé Darce 21 Aug '08

21 Aug '08

>> On the side of pier, accented characters spend. By against the same >> asString text under squeak includes characters incomprehensible. >> Moreover, I can not write with the keyboard one character accentuated in >> squeak, it displays a debugger. >> > > You are using a different encoding on the web, than Squeak is using internally. > > Pier and Seaside normally treat data as byte-arrays, they don't care > what encoding they have (that works well for what Seaside and Pier are > doing). This is what the server-adapter WAKom is doing (or not doing). > > If you want to convert data coming from the web to Squeak format, then > use WAKomEncoded instead of WAKom. This converts all data coming in > and going out to the right format, but is also sort of slow. > > Don't miss the talk of Philippe: > > http://www.esug.org/Conferences/2008/WideStrings+and+utf-8 > > Cheers, > Lukas > > How to write a character accentuated with my keyboard? Squeak displays the debbuger when I strike on the "é" on the keyboard. I can't use accented characters into squeak with keyboard. How to write a utf8 file? I am Linux utf8. So How to use utf8 and not latin-1 into squeak? Thank you for your help

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Beginners August 2008