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

Re: [Pharo-users] Pharo 3.0 image shrink

by Alain Busser

Welcome to the club ;-) Alain On Sun, Mar 16, 2014 at 10:22 PM, Hilaire Fernandes < hilaire.fernandes(a)gmail.com> wrote: > I will, but I need to reiterate because I removed a bit two much. > > Hilaire > > Le 16/03/2014 11:21, Pharo4Stef a Ã©crit : > > could you let me know the list of classes you are in the system. > > This is clear that we should spend some months on that to get progress. > > -- > Dr. Geo http://drgeo.eu > > >

March 17, 2014

Re: [Pharo-users] Calculate angle between two vectors (probably @Igor :)

by Alain Busser

First of all, you could simplify your code with dotProduct, writing dot2 := p1 dotProduct: p2. But maybe you just need ((p1 normalized) dotProduct: (p2 normalized)) arcCos ;-) You can also explore the polar coordinates... Alain On Sun, Mar 16, 2014 at 8:01 PM, MartinW <wm(a)fastmail.fm> wrote: > Hello, > i probably made some embarassing mistake, but as i cannot find it, i ask > you > to have a look at this method. > It should calculate the angle between two vectors. And vectors are > instances > of Point (perhaps here is already a misconception?). > It is used in my flocking simulation PharoBoids > (http://smalltalkhub.com/#!/~MartinWalk/Boids) > > Here is my version of the method: > > angleBetween: vector1 and: vector2 onError: aBlock > | cosinusOfAngle innerProductOfVectors productOfVectorsLengths| > innerProductOfVectors := (vector1 dotProduct: vector2). > productOfVectorsLengths := (vector1 r) * (vector2 r). > productOfVectorsLengths = 0 ifTrue: [ ^ aBlock value ]. > cosinusOfAngle := innerProductOfVectors / productOfVectorsLengths. > ^ cosinusOfAngle arcCos > > But my Boids behave wrong when i use it. I found another implementation of > the same problem by Igor Stasenko which works and looks like this: > > angleBetween: p1 and: p2 ifDegenerate: aBlock > " Calculate an angle (in radians) between two vectors. > Evaluate a block, in case if calculation not possible because one of the > vectors has zero length " > > | x1 y1 x2 y2 dot2 n2 | > x1 := p1 x. > y1 := p1 y. > x2 := p2 x. > y2 := p2 y. > > dot2 := x1 * x2 + (y1 * y2). > dot2 := dot2 * dot2. > > n2 := (x1*x1 + (y1*y1)) * (x2*x2 + (y2*y2)). > > n2 = 0 ifTrue: [ ^ aBlock value ]. > > ^ (dot2 / n2) arcCos > > Can anybody explain the problem of my method? M. > > > > -- > View this message in context: > http://forum.world.st/Calculate-angle-between-two-vectors-probably-Igor-tp4… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

March 17, 2014

Re: [Pharo-users] Pharo 3.0 image shrink

by Hilaire Fernandes

I will, but I need to reiterate because I removed a bit two much. Hilaire Le 16/03/2014 11:21, Pharo4Stef a Ã©crit : > could you let me know the list of classes you are in the system. > This is clear that we should spend some months on that to get progress. -- Dr. Geo http://drgeo.eu

March 16, 2014

Re: [Pharo-users] Calculate angle between two vectors (probably @Igor :)

by Nicolai Hess

Rounding error? This may be the reason, igor's version is working with cos = (a dot b)^2 / (|ab|^2) while you are using cos = (a dot b) / |ab| 2014-03-16 17:01 GMT+01:00 MartinW <wm(a)fastmail.fm>: > Hello, > i probably made some embarassing mistake, but as i cannot find it, i ask > you > to have a look at this method. > It should calculate the angle between two vectors. And vectors are > instances > of Point (perhaps here is already a misconception?). > It is used in my flocking simulation PharoBoids > (http://smalltalkhub.com/#!/~MartinWalk/Boids) > > Here is my version of the method: > > angleBetween: vector1 and: vector2 onError: aBlock > | cosinusOfAngle innerProductOfVectors productOfVectorsLengths| > innerProductOfVectors := (vector1 dotProduct: vector2). > productOfVectorsLengths := (vector1 r) * (vector2 r). > productOfVectorsLengths = 0 ifTrue: [ ^ aBlock value ]. > cosinusOfAngle := innerProductOfVectors / productOfVectorsLengths. > ^ cosinusOfAngle arcCos > > But my Boids behave wrong when i use it. I found another implementation of > the same problem by Igor Stasenko which works and looks like this: > > angleBetween: p1 and: p2 ifDegenerate: aBlock > " Calculate an angle (in radians) between two vectors. > Evaluate a block, in case if calculation not possible because one of the > vectors has zero length " > > | x1 y1 x2 y2 dot2 n2 | > x1 := p1 x. > y1 := p1 y. > x2 := p2 x. > y2 := p2 y. > > dot2 := x1 * x2 + (y1 * y2). > dot2 := dot2 * dot2. > > n2 := (x1*x1 + (y1*y1)) * (x2*x2 + (y2*y2)). > > n2 = 0 ifTrue: [ ^ aBlock value ]. > > ^ (dot2 / n2) arcCos > > Can anybody explain the problem of my method? M. > > > > -- > View this message in context: > http://forum.world.st/Calculate-angle-between-two-vectors-probably-Igor-tp4… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

March 16, 2014

Re: [Pharo-users] Metacello changes in Pharo 3?

by MartinW

Christophe Demarey wrote > â¦ Metacello 2 (also known as Metacello Preview) that is now used in Pharo > 3.0. Thank you, this was the missing information :) And i just tried Versionner. It works very well. Thank you. I did not know about it's existence. M. -- View this message in context: http://forum.world.st/Metacello-changes-in-Pharo-3-tp4749011p4749353.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

March 16, 2014

Calculate angle between two vectors (probably @Igor :)

by MartinW

Hello, i probably made some embarassing mistake, but as i cannot find it, i ask you to have a look at this method. It should calculate the angle between two vectors. And vectors are instances of Point (perhaps here is already a misconception?). It is used in my flocking simulation PharoBoids (http://smalltalkhub.com/#!/~MartinWalk/Boids) Here is my version of the method: angleBetween: vector1 and: vector2 onError: aBlock | cosinusOfAngle innerProductOfVectors productOfVectorsLengths| innerProductOfVectors := (vector1 dotProduct: vector2). productOfVectorsLengths := (vector1 r) * (vector2 r). productOfVectorsLengths = 0 ifTrue: [ ^ aBlock value ]. cosinusOfAngle := innerProductOfVectors / productOfVectorsLengths. ^ cosinusOfAngle arcCos But my Boids behave wrong when i use it. I found another implementation of the same problem by Igor Stasenko which works and looks like this: angleBetween: p1 and: p2 ifDegenerate: aBlock " Calculate an angle (in radians) between two vectors. Evaluate a block, in case if calculation not possible because one of the vectors has zero length " | x1 y1 x2 y2 dot2 n2 | x1 := p1 x. y1 := p1 y. x2 := p2 x. y2 := p2 y. dot2 := x1 * x2 + (y1 * y2). dot2 := dot2 * dot2. n2 := (x1*x1 + (y1*y1)) * (x2*x2 + (y2*y2)). n2 = 0 ifTrue: [ ^ aBlock value ]. ^ (dot2 / n2) arcCos Can anybody explain the problem of my method? M. -- View this message in context: http://forum.world.st/Calculate-angle-between-two-vectors-probably-Igor-tp4… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

March 16, 2014

Re: [Pharo-users] Pharo 3.0 image shrink

by Pharo4Stef

On 15 Mar 2014, at 22:22, Hilaire Fernandes <hilaire.fernandes(a)gmail.com> wrote: > Even with commenting out checkState, the VM crash or the display is all > white. Just achieved a shrink to ~17MB > > I applyed my pharo 1.4 cleaning and only get to 16.7MB. > So far, not really great. could you let me know the list of classes you are in the system. This is clear that we should spend some months on that to get progress. Stef > > Hilaire > > > Le 15/03/2014 18:46, Hilaire Fernandes a Ã©crit : >> Hi Stef, >> >> Yes it is tedious, I had fairly success with Pharo 1.4 to get it down to >> about 10MB for DrGeo release image. >> >> So, in the mean time, I will take a try with your suggestion and see how >> the cleaning for 1.4 worked now. >> >> Thanks >> >> Hilaire >> >> >> Le 15/03/2014 18:39, Pharo4Stef a Ã©crit : >>> Hi hilaire >>> >>> pay attention unloading is a pain (this is why unreloader does not try to nicely unload). >>> The goal of unreloader is to make sure that we get good configuration to load from pavel mini image. >>> Now unreloader does crash the vm on mac. So comment the checkState method and normally you should >>> get a system without some of the tool. >>> If you want to help we can work on that toegther. (first I want to finish the pass I want to do on the catalog). >>> >>> Stef >>> On 15 Mar 2014, at 16:29, Hilaire Fernandes <hilaire.fernandes(a)gmail.com> wrote: >>> >>>> Hi, >>>> >>>> I want to look at shrinking Pharo 3.0 image for iStoa. In that context I >>>> don't need anymore the developer tools >>>> >>>> In Pharo 1.4 I experimented with unload-packages-and see-of-it-broke-or >>>> not-the-image. >>>> Do we have a better way to do it with 3.0? >>>> Which package to remove and how? I remember the other of unloading matter. >>>> >>>> I just tried UnReloader package. But "UnReloader new unload" turn my >>>> Pharo display all white. However, it looks like it is still working. Is >>>> it normal? >>>> >>>> Thanks >>>> >>>> Hilaire >>>> >>>> -- >>>> Dr. Geo http://drgeo.eu >>>> >>>> >>> >>> >>> >> > > -- > Dr. Geo http://drgeo.eu > >

March 16, 2014

Re: [Pharo-users] Pharo 3.0 image shrink

by Hilaire Fernandes

Never mind, I already moved forward in another direction. Thanks and keep going on this great effort. Hilaire Le 16/03/2014 10:04, Sven Van Caekenberghe a Ã©crit : > I don't think this work is meant to be 'public facing', it is more an ongoing development effort at modularization and bootstrapping. One day, all this will probably lead to a single script that allows end users to shrink an image, but we're not here yet. > > BTW, the image size is only a problem in a very limited number of cases. > > On 16 Mar 2014, at 08:27, Hilaire Fernandes <hilaire.fernandes(a)gmail.com> wrote: > >> It is very sad there is no indication what to do with this work. I >> download the zip archive but see not input. Please guy, write at least a >> four lines note in a readme.txt file. >> https://ci.inria.fr/pharo-contribution/view/Pharo-Kernel-3.0/job/PharoKerne… >> >> Hilaire >> >> Le 15/03/2014 16:46, Luc Fabresse a Ã©crit : >>> Hi Hilaire, >>> >>> Do you know that Pavel made a great job on this front? >>> http://forum.world.st/Pavel-Krivanek-s-unloading-script-for-Pharo-td4737979… >>> >>> Cheers, >>> >>> #Luc >>> >>> >>> 2014-03-15 16:29 GMT+01:00 Hilaire Fernandes >>> <hilaire.fernandes(a)gmail.com >>> <mailto:hilaire.fernandes@gmail.com>>: >>> >>> Hi, >>> >>> I want to look at shrinking Pharo 3.0 image for iStoa. In that context I >>> don't need anymore the developer tools >>> >>> In Pharo 1.4 I experimented with unload-packages-and see-of-it-broke-or >>> not-the-image. >>> Do we have a better way to do it with 3.0? >>> Which package to remove and how? I remember the other of unloading >>> matter. >>> >>> I just tried UnReloader package. But "UnReloader new unload" turn my >>> Pharo display all white. However, it looks like it is still working. Is >>> it normal? >>> >>> Thanks >>> >>> Hilaire >>> >>> -- >>> Dr. Geo http://drgeo.eu >>> >>> >>> >> >> -- >> Dr. Geo http://drgeo.eu > > > -- Dr. Geo http://drgeo.eu

March 16, 2014

Re: [Pharo-users] Pharo 3.0 image shrink

by Sven Van Caekenberghe

I don't think this work is meant to be 'public facing', it is more an ongoing development effort at modularization and bootstrapping. One day, all this will probably lead to a single script that allows end users to shrink an image, but we're not here yet. BTW, the image size is only a problem in a very limited number of cases. On 16 Mar 2014, at 08:27, Hilaire Fernandes <hilaire.fernandes(a)gmail.com> wrote: > It is very sad there is no indication what to do with this work. I > download the zip archive but see not input. Please guy, write at least a > four lines note in a readme.txt file. > https://ci.inria.fr/pharo-contribution/view/Pharo-Kernel-3.0/job/PharoKerne… > > Hilaire > > Le 15/03/2014 16:46, Luc Fabresse a Ã©crit : >> Hi Hilaire, >> >> Do you know that Pavel made a great job on this front? >> http://forum.world.st/Pavel-Krivanek-s-unloading-script-for-Pharo-td4737979… >> >> Cheers, >> >> #Luc >> >> >> 2014-03-15 16:29 GMT+01:00 Hilaire Fernandes >> <hilaire.fernandes(a)gmail.com >> <mailto:hilaire.fernandes@gmail.com>>: >> >> Hi, >> >> I want to look at shrinking Pharo 3.0 image for iStoa. In that context I >> don't need anymore the developer tools >> >> In Pharo 1.4 I experimented with unload-packages-and see-of-it-broke-or >> not-the-image. >> Do we have a better way to do it with 3.0? >> Which package to remove and how? I remember the other of unloading >> matter. >> >> I just tried UnReloader package. But "UnReloader new unload" turn my >> Pharo display all white. However, it looks like it is still working. Is >> it normal? >> >> Thanks >> >> Hilaire >> >> -- >> Dr. Geo http://drgeo.eu >> >> >> > > -- > Dr. Geo http://drgeo.eu

March 16, 2014

Re: [Pharo-users] Pharo 3.0 image shrink

by Hilaire Fernandes

It is very sad there is no indication what to do with this work. I download the zip archive but see not input. Please guy, write at least a four lines note in a readme.txt file. https://ci.inria.fr/pharo-contribution/view/Pharo-Kernel-3.0/job/PharoKerne… Hilaire Le 15/03/2014 16:46, Luc Fabresse a Ã©crit : > Hi Hilaire, > > Do you know that Pavel made a great job on this front? > http://forum.world.st/Pavel-Krivanek-s-unloading-script-for-Pharo-td4737979… > > Cheers, > > #Luc > > > 2014-03-15 16:29 GMT+01:00 Hilaire Fernandes > <hilaire.fernandes(a)gmail.com > <mailto:hilaire.fernandes@gmail.com>>: > > Hi, > > I want to look at shrinking Pharo 3.0 image for iStoa. In that context I > don't need anymore the developer tools > > In Pharo 1.4 I experimented with unload-packages-and see-of-it-broke-or > not-the-image. > Do we have a better way to do it with 3.0? > Which package to remove and how? I remember the other of unloading > matter. > > I just tried UnReloader package. But "UnReloader new unload" turn my > Pharo display all white. However, it looks like it is still working. Is > it normal? > > Thanks > > Hilaire > > -- > Dr. Geo http://drgeo.eu > > > -- Dr. Geo http://drgeo.eu

March 16, 2014