February 2011 - Pharo-users

Pharocasts: GUI with Polymorph

by laurent laffont

Develop a contact manager desktop application. You will learn: - how Pharo helps the "Program by intention" style of programming - how to create basic persistency of created Contact object - how to compose a GUI, basic widgets, events and layout http://www.pharocasts.com/2011/02/pharo-gui-with-polymorph.html <http://www.pharocasts.com/2011/02/pharo-gui-with-polymorph.html> Laurent Laffont - @lolgzs <http://twitter.com/#!/lolgzs> Pharo Smalltalk Screencasts: http://www.pharocasts.com/ Blog: http://magaloma.blogspot.com/

Feb. 3, 2011

Re: [Pharo-users] Matrix

by Werner Kassens

Hi HernÃ¡n i wasn't aware of this, it is interesting indeed. thanks werner > Have you tried the DhbMatrix at http://www.squeaksource.com/DHBNumerical.html ?

Feb. 3, 2011

Re: [Pharo-users] Matrix

by HernÃ¡n Morales Durand

Hi Wener, Have you tried the DhbMatrix at http://www.squeaksource.com/DHBNumerical.html ? Cheers, HernÃ¡n 2011/2/2 Werner Kassens <wkassens(a)libello.com>: > Hi, > i use Pharo-1.1-11411 and got a few questions. > i looked at the comments of Matrix: > > it talks about Array2D but this object does not exist? > > it says "Element-wise matrix arithmetic works", but this is not true: > while + - * functions in this way: aNumber + aMatrix, "/" does not always > function: > aSmallInteger / aMatrix produces an error, because aMatrix is tested with > isZero. > a simple fix would be to change the first program line in SmallInteger>>/ > from: > aNumber isZero ifTrue: [^(ZeroDivide dividend: self) signal]. to: > (aNumber isNumber and: [aNumber isZero]) ifTrue: [^(ZeroDivide dividend: > self) signal]. > further aMatrix + aNumber and similar arithmetic dont work. but with the > above fix it would work nicely with Â simple implementations like this: > Collection>>/ > / aNumber > ^aNumber Â adaptToCollection: self Â andSend: #/ > and so forth. > > while testing these things with Fractions, i noticed this: > printing {3/4} produces this output:{(3/4)}. > printing {{0.75}} produces this output:#(#(0.75)). > printing {{3/4}} produces this output:{((Array new: 1) at: 1 put: (3/4); > yourself)}. > i wonder what the last output wants to tell me? does it want to tell me, > that the last thing uses up a lot more memory than the first two, and > accessing it takes more time, so that i should use the second thing instead, > or is it (more or less) just print output related? > werner > >

Feb. 3, 2011

Re: [Pharo-users] Matrix

by StÃ©phane Ducasse

long time ago I guess there was a class Array2D which could work as a matrix. Now I do not remember if it was replaced or rewritten. Stef On Feb 2, 2011, at 9:26 PM, Werner Kassens wrote: > Hi, > i use Pharo-1.1-11411 and got a few questions. > i looked at the comments of Matrix: > > it talks about Array2D but this object does not exist? > > it says "Element-wise matrix arithmetic works", but this is not true: > while + - * functions in this way: aNumber + aMatrix, "/" does not always function: > aSmallInteger / aMatrix produces an error, because aMatrix is tested with isZero. > a simple fix would be to change the first program line in SmallInteger>>/ from: > aNumber isZero ifTrue: [^(ZeroDivide dividend: self) signal]. to: > (aNumber isNumber and: [aNumber isZero]) ifTrue: [^(ZeroDivide dividend: self) signal]. > further aMatrix + aNumber and similar arithmetic dont work. but with the above fix it would work nicely with simple implementations like this: > Collection>>/ > / aNumber > ^aNumber adaptToCollection: self andSend: #/ > and so forth. > > while testing these things with Fractions, i noticed this: > printing {3/4} produces this output:{(3/4)}. > printing {{0.75}} produces this output:#(#(0.75)). > printing {{3/4}} produces this output:{((Array new: 1) at: 1 put: (3/4); yourself)}. > i wonder what the last output wants to tell me? does it want to tell me, that the last thing uses up a lot more memory than the first two, and accessing it takes more time, so that i should use the second thing instead, or is it (more or less) just print output related? > werner >

Feb. 2, 2011

Matrix

by Werner Kassens

Hi, i use Pharo-1.1-11411 and got a few questions. i looked at the comments of Matrix: it talks about Array2D but this object does not exist? it says "Element-wise matrix arithmetic works", but this is not true: while + - * functions in this way: aNumber + aMatrix, "/" does not always function: aSmallInteger / aMatrix produces an error, because aMatrix is tested with isZero. a simple fix would be to change the first program line in SmallInteger>>/ from: aNumber isZero ifTrue: [^(ZeroDivide dividend: self) signal]. to: (aNumber isNumber and: [aNumber isZero]) ifTrue: [^(ZeroDivide dividend: self) signal]. further aMatrix + aNumber and similar arithmetic dont work. but with the above fix it would work nicely with simple implementations like this: Collection>>/ / aNumber ^aNumber adaptToCollection: self andSend: #/ and so forth. while testing these things with Fractions, i noticed this: printing {3/4} produces this output:{(3/4)}. printing {{0.75}} produces this output:#(#(0.75)). printing {{3/4}} produces this output:{((Array new: 1) at: 1 put: (3/4); yourself)}. i wonder what the last output wants to tell me? does it want to tell me, that the last thing uses up a lot more memory than the first two, and accessing it takes more time, so that i should use the second thing instead, or is it (more or less) just print output related? werner

Feb. 2, 2011

Re: [Pharo-users] auto compile accessors / updators

by Phil

Thanks Stephanie. I hadn't noticed accessors in the refactoring engine. Thanks for the heads-up. It'll do the job for now :) On 01/02/2011, at 4:42 PM, StÃ©phane Ducasse wrote: > Not that I know. > But it should be easy to code using compile: and friends. > If you do it send us your license agreement and the code :) > > Now you can also use the refactoring engine and the browser to generate accessors. > >> Is there an equivalent in in pharo/squeak of the GemStone method #compileMissingAccessingMethods

Feb. 1, 2011

Re: [Pharo-users] auto compile accessors / updators

by StÃ©phane Ducasse

Not that I know. But it should be easy to code using compile: and friends. If you do it send us your license agreement and the code :) Now you can also use the refactoring engine and the browser to generate accessors. > Is there an equivalent in in pharo/squeak of the GemStone method #compileMissingAccessingMethods > > cheers, > > phil >

Feb. 1, 2011

auto compile accessors / updators

by Phil

Is there an equivalent in in pharo/squeak of the GemStone method #compileMissingAccessingMethods cheers, phil

Feb. 1, 2011