Hello :) I think I have seen such a package on squeaksource once :s Sorry for not being able to help more :( Ben On Aug 2, 2012, at 12:18 AM, Igor Stasenko wrote:

On 2 August 2012 00:03, Clara Allende <clari.allende@gmail.com> wrote:

...

Hi guys, after having exhausting four months of Physics lessons, I decided that would be fun to write a program to deal with Electricity problems :) (Yeah, I'm not a normal person :P)

welcome to the club! :)

...

So, I need to make differential and integral calculus, are there any libraries to do so? Or any place that I can take a look at?

sorry no idea.. i posted just to welcome , and i usually inhabiting a lowest depths of our beautiful world (VM / infrastructure) .. and things you asking about is a bit too high to me :)

...

Thanks in advance!

Cheers

-- Best regards, Igor Stasenko.

Yes Daniel has done some work in the context of his gsoc. Daniel can you introduce your work ? You are welcome if you want to help. Regards, Envoyé de mon iPad Le 2 août 2012 à 06:58, Dale Henrichs <dhenrich@vmware.com> a écrit :

Clara,

I am not mathematician, but Serge Stinckwich has a boatload of Math implementations collected in his SciSmalltalk project[1]: "Tools for scientific computation in Smalltalk". He and Daniel Uber have been working together on the project... You might find some of what you are looking for...

[1] https://github.com/SergeStinckwich/SciSmalltalk

----- Original Message ----- | From: "Benjamin" <benjamin.vanryseghem.pharo@gmail.com> | To: Pharo-project@lists.gforge.inria.fr | Sent: Wednesday, August 1, 2012 4:21:55 PM | Subject: Re: [Pharo-project] Differential and Integral calculus in Pharo? | | Hello :) | | I think I have seen such a package on squeaksource once :s | | Sorry for not being able to help more :( | | Ben | | On Aug 2, 2012, at 12:18 AM, Igor Stasenko wrote: | | > On 2 August 2012 00:03, Clara Allende <clari.allende@gmail.com> | > wrote: | >> Hi guys, after having exhausting four months of Physics lessons, I | >> decided | >> that would be fun to write a program to deal with Electricity | >> problems :) | >> (Yeah, I'm not a normal person :P) | > | > welcome to the club! :) | > | >> | >> So, I need to make differential and integral calculus, are there | >> any | >> libraries to do so? Or any place that I can take a look at? | >> | > sorry no idea.. i posted just to welcome , and i usually inhabiting | > a | > lowest depths of our beautiful | > world (VM / infrastructure) .. and things you asking about is a bit | > too high to me :) | > | >> Thanks in advance! | >> | >> Cheers | > | > | > | > -- | > Best regards, | > Igor Stasenko. | > | | |

Maxima is pretty cool indeed. For inspiration, wxMaxima is a UI built on top. That's what we use over here for maths stuff with my wife. There is also Octave for numerical computing, Maxima being on the symbolic side. 2012/8/2 Lawson English <lenglish5@cox.net>

Recently, I ran into this: http://maxima.sourceforge.net/

an interface/binding lib might be easier than writing your own from scratch.

L

On 8/1/12 3:03 PM, Clara Allende wrote:

...

Hi guys, after having exhausting four months of Physics lessons, I decided that would be fun to write a program to deal with Electricity problems :) (Yeah, I'm not a normal person :P)

So, I need to make differential and integral calculus, are there any libraries to do so? Or any place that I can take a look at?

Thanks in advance!

Cheers

-- Squeak from the very start (introduction to Squeak and Pharo Smalltalk for the (almost) complete and compleate beginner). https://www.youtube.com/**playlist?list=**PL6601A198DF14788D&feature=** view_all<https://www.youtube.com/playlist?list=PL6601A198DF14788D&feature=view_all>

Did you try to use this bridge ? Envoyé de mon iPhone Le 2 août 2012 à 16:55, Frank Shearar <frank.shearar@gmail.com> a écrit :

There's also NumPy and SciPy, which you can talk to via OpenQwaq's (GPL'd) Python-Smalltalk bridge.

frank

On 2 August 2012 10:16, phil@highoctane.be <phil@highoctane.be> wrote:

...

Maxima is pretty cool indeed. For inspiration, wxMaxima is a UI built on top. That's what we use over here for maths stuff with my wife. There is also Octave for numerical computing, Maxima being on the symbolic side.

2012/8/2 Lawson English <lenglish5@cox.net>

...

Recently, I ran into this: http://maxima.sourceforge.net/

an interface/binding lib might be easier than writing your own from scratch.

L

On 8/1/12 3:03 PM, Clara Allende wrote:

...

Hi guys, after having exhausting four months of Physics lessons, I decided that would be fun to write a program to deal with Electricity problems :) (Yeah, I'm not a normal person :P)

So, I need to make differential and integral calculus, are there any libraries to do so? Or any place that I can take a look at?

Thanks in advance!

Cheers

-- Squeak from the very start (introduction to Squeak and Pharo Smalltalk for the (almost) complete and compleate beginner). https://www.youtube.com/playlist?list=PL6601A198DF14788D&feature=view_all

Thanks for all your answers guys! This is very interesting :) @Guille yes, I know and I already told you yesterday that I will study for tomorrow's exam and then play with crazy math stuff in Pharo :P @Serge I took a look at your work (and Daniel's), it is awesome! I will get deeper into it next week, promise :) On 2 August 2012 09:10, Frank Shearar <frank.shearar@gmail.com> wrote:

It's not hit the top of my todo list, but it is ON the list. (And it's on the todo list primarily to try NumPy/SciPy, because those are libraries most interesting to me.)

frank

On 2 August 2012 11:14, Serge Stinckwich <serge.stinckwich@gmail.com> wrote:

...

Did you try to use this bridge ?

Envoyé de mon iPhone

Le 2 août 2012 à 16:55, Frank Shearar <frank.shearar@gmail.com> a écrit :

...

There's also NumPy and SciPy, which you can talk to via OpenQwaq's (GPL'd) Python-Smalltalk bridge.

frank

On 2 August 2012 10:16, phil@highoctane.be <phil@highoctane.be> wrote:

...

Maxima is pretty cool indeed. For inspiration, wxMaxima is a UI built on top. That's what we use over here for maths stuff with my wife. There is also Octave for numerical computing, Maxima being on the symbolic side.

2012/8/2 Lawson English <lenglish5@cox.net>

...

Recently, I ran into this: http://maxima.sourceforge.net/

an interface/binding lib might be easier than writing your own from scratch.

L

On 8/1/12 3:03 PM, Clara Allende wrote:

...

Hi guys, after having exhausting four months of Physics lessons, I decided that would be fun to write a program to deal with Electricity problems :) (Yeah, I'm not a normal person :P)

So, I need to make differential and integral calculus, are there any libraries to do so? Or any place that I can take a look at?

Thanks in advance!

Cheers

-- Squeak from the very start (introduction to Squeak and Pharo

Smalltalk for

...

the (almost) complete and compleate beginner).

https://www.youtube.com/playlist?list=PL6601A198DF14788D&feature=view_all

...

I trained bunch of 4 smalltalkers to push its life ahead. It was a great piece of work, looked slick on VW and according to the Tektronix guys, the engineers preferred it to the C++ version... they were being asked to use.. so it was being revived when I heard last in 2005. But Tektronix itself got bought over not much long after.. On Fri, Aug 3, 2012 at 9:08 PM, Dale Henrichs <dhenrich@vmware.com> wrote:

Krish,

Haha, funny that you mention that ... I wrote that software, called ADS (for Analog IC Design System), while working at Tektronix. That was the project that I cut my Smalltalk teeth on:)

I started the project using the Tek 4404 in 1985.

When Tektronix got out of the Smalltalk business (another story) I ported ADS to ObjectWorks. I left Tektronix in 1992 to go to work for Digitalk.

The team at Tektronix kept working on ADS, porting it to the newer platforms over time ...

The last time I checked ADS was still being used ... that was around 2005, I think.

So it's had a long and productive lifetime.

Dale

----- Original Message ----- | From: "S Krish" <krishnamachari.sudhakar@gmail.com> | To: Pharo-project@lists.gforge.inria.fr | Sent: Friday, August 3, 2012 5:55:28 AM | Subject: Re: [Pharo-project] Differential and Integral calculus in Pharo? | | | | Yes, I remember my love for Kirchoff's circuit laws years back..!!.. | | | Electronics: | | | | A matrix version of Kirchhoff's current law is the basis of most | circuit simulation software , such as SPICE / PSPICE. Interesting to | have a interface to PSPICE as Tektronix had/ may still have in VW. | Build it out of Pharo, we could have the challenge to Cadence..with | their C++ ecquivalent.. | | | Had an opportunity to see that VW stuff with its simulation of VLSI | circuits running up 60000 elements.. and complex simulations.. real | time. Cool stuff.. | | | | On Thu, Aug 2, 2012 at 3:33 AM, Clara Allende < | clari.allende@gmail.com > wrote: | | | Hi guys, after having exhausting four months of Physics lessons, I | decided that would be fun to write a program to deal with | Electricity problems :) (Yeah, I'm not a normal person :P) | | | So, I need to make differential and integral calculus, are there any | libraries to do so? Or any place that I can take a look at? | | | Thanks in advance! | | | Cheers |

On Aug 5, 2012, at 5:20 PM, Schwab,Wilhelm K wrote:

short of symbolic manipulation (e.g. maple), all we do is discretize and approximate, right?

Integration (aka quadrature) is "easy" but numerical diff is very unstable. ODEs solve well w/ Runge-Kutta methods.

Definitely, for some simple problems. Just to scratch the surface...Besset only provides two quadrature methods: Romberg and Simpson both of which are very problematic for many integrals (accumulation of underflow being one of the more common but I'm sure google can probably give you a longer list than I can). If I remember correctly neither of his algorithms employ adaptive step sizes (although I think that they respond to "data sources" with varying step sizes properly) so be ready for arbitrarily large errors with rapidly varying integrands. Most of the better libraries provide adaptive integrators and several variants of them because the world of "quadrature" is not one-size-fits all. The book "Numerical Recipes" (Press et al) touches the only the tip of this iceberg but its a start for those that want to go beyond Besset's book. As for diff-eqs: I don't think Besset includes Runge-Kutta or any other diff-eq integrators. RK or Adam's Bashforth are simple enough to implement, though, but again said implementation will likely be problematic, especially for very stiff equations but even in simpler cases for systems of equations that have singularities (despite the name, singularities in systems of equations are very common). More sophisticated solvers deal with these things well or one looks for specialized solvers for the problems at hand. None of this touches on problems that will likely arise from the types of problems the original poster is trying to solve (they only specified E & M). Maxwell's equations (time and space dependent PDE's) will require making both time and space discrete, which in multiple dimensions can be prohibitive due to both memory and time constraints. Normally one has to apply some knowledge of the physics to simplify the problem...or just start with a very simple problem ;-) I'm assuming the original poster will start with some problems with high degrees of symmetry and move forward from there. That is a great approach to learning numerical approaches to solving physics problems and simple tools will get them a long way. David