[sympy] Re: Introducing Myself to Sympy Developers Team.

2018-02-26 Thread aarish17212
I would love to contribute in Sympy. So I want to know about the main code 
base of Sympy. Where can I get that? so that i can perform some changes in 
them regarding issues.


On Tuesday, February 27, 2018 at 11:02:34 AM UTC+5:30, aaris...@iiitd.ac.in 
wrote:
>
> Hello Everyone,
>
> I am Aarish Chhabra, pursuing Btech at IIITDelhi in Computer Science and 
> Applied Mathematics.I am currently in my 1st Year.I found Sympy quite 
> interesting especially the mathematics modules.I have been exploring sympy 
> from some previous days and have gone through all the instructions.
>

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[sympy] Introducing Myself to Sympy Developers Team.

2018-02-26 Thread aarish17212
Hello Everyone,

I am Aarish Chhabra, pursuing Btech at IIITDelhi in Computer Science and 
Applied Mathematics.I am currently in my 1st Year.I found Sympy quite 
interesting especially the mathematics modules.I have been exploring sympy 
from some previous days and have gone through all the instructions.

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Re: [sympy] Introducing myself to the SymPy Community

2018-02-26 Thread Jason Moore
Monish,

You can get started with GSoC SymPy here:
https://github.com/sympy/sympy/wiki/GSoC-2018-Student-Instructions

Jason

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On Thu, Feb 22, 2018 at 11:09 PM, Monish Kapadia 
wrote:

> Hello everyone,
>
> My name is Monish Kapadia. I have done by Bachelor of Engineering in
> Electronics from Mumbai University.
>
> During my engineering course I have done many projects like Autonomous
> Surveillance Bot, Inertial Sensor Based Pen, etc. For these projects I had
> used Python as the programming language alongwith modules like numpy,
> OpenCV, SciPy, Dropbox, etc. and few algorithms to achieve the result.
>
> Languages I'm familiar with are Python, WebDevelopment(HTML, CSS,
> JavaScript, Node.js, jQuery, MongoDB, SQL), C, Java. I have recently
> developed a website http://www.hiddenwonderz.com (Github source:
> https://github.com/monishk10/hiddenwonderz)
>
> If given a chance I will definitely prove to be an apt addition to the
> community.
>
> Thanks,
> Monish
>
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[sympy] Re: Request for help GSOC Sympy

2018-02-26 Thread Jason Moore
Suprotik,

You can get started with GSoC here:
https://github.com/sympy/sympy/wiki/GSoC-2018-Student-Instructions

Jason

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On Thu, Feb 22, 2018 at 11:26 PM, SAMPAD SAHA  wrote:

> Hi Suprotik,
>
> I am glad that you are interested in working on Beam Solving System. You
> can look into this Singularity Function
> 
>  and
> Beam
> 
> classes to start with. I think when I was working on this project I have
> missed the implementation that solves cantilever beam problems. You can
> start by adding that feature. You can also read my blog
>  to understand the work that I have
> done for this project.
>
> I am adding Jason Moore in this thread who was my mentor. He is very
> friendly and kind person. He can help you with the further ideas needed for
> this project.
>
> Happy Coding!!!
>
>
>
> ‌
>
> Regards
> Sampad Kumar Saha
> Mathematics and Computing
> Department of Mathematics
> I.I.T. Kharagpur
>
> On Thu, Feb 22, 2018 at 9:05 PM, Suprotik Dey  wrote:
>
>> Hi Sampad,
>>
>> I am a 3rd year undergraduate from IIEST, Shibpur, and I am willing to
>> participate in GSOC 2018 with SymPy as my organization.
>>
>> I am thinking about continuing your GSOC 2016 project on Continuum
>> Mechanics: Create a Rich 2D Beam Solving System
>> https://github.com/sympy/sympy/wiki/GSoC-2018-Ideas#continuu
>> m-mechanics-create-a-rich-2d-beam-solving-system
>>
>> I request your help in understanding the codebase and proceed further.
>>
>> --
>> *Thanking you,*
>> *Yours sincerely,*
>>
>> *Suprotik Dey*
>> *Ph.: +918334826685 <+91%2083348%2026685>*
>> *Enrollment ID: 510815050*
>> *I.T. Third Year*
>> *IIEST, Shibpur*
>> ‌
>>  Sent with Mailtrack
>> 
>>
>
>

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Re: [sympy] GSoC 2018 : Project discussion

2018-02-26 Thread Jason Moore
Arighna,

> Can someone guide me as to how much work has been done in these two arenas

Lots has been done, see
http://docs.sympy.org/latest/modules/series/series.html and
http://docs.sympy.org/latest/modules/solvers/solvers.html#ordinary-differential-equations-odes

> and how much more needs to be done?

Lots more!

> I have solved some bugs related to series and convergence of limits in
series. And I find that some methods like `is_convergent()` break a lot. Is
there a scope of improvement for limits of series? Series expansions and
optimizing rs_series are also under my radar.

Sounds like a good place to investigate.

> And when should I submit the proposal on the SymPy WiKi page? Like, Can
we start writing ?

Anytime you want, and yes feel free to start writing.

You can get started here:
https://github.com/sympy/sympy/wiki/GSoC-2018-Student-Instructions

Jason

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On Fri, Feb 23, 2018 at 8:24 PM,  wrote:

> Hello everyone,
>
> I am Arighna Chakrabarty, a 2nd year student in Electronics and
> Communication Engineering in IIT Guwahati. I have been contributing to the
> codebase of SymPy since December 2017, and will be submitting a GSoC
> application this year.
>
> I have my eyes on two Mathematical Projects : 1) Series Expansions and 2)
> Ordinary Differential Equation( especially implementing the PDE part in
> SymPy)
> Can someone guide me as to how much work has been done in these two
> arenas, and how much more needs to be done?
>
> I have solved some bugs related to series and convergence of limits in
> series. And I find that some methods like `is_convergent()` break a lot. Is
> there a scope of improvement for limits of series? Series expansions and
> optimizing rs_series are also under my radar.
>
> And when should I submit the proposal on the SymPy WiKi page? Like, Can we
> start writing ?
>
> Thanks in advance,
> Arighna Chakrabarty
>
> Github Handle - https://github.com/ArighnaIITG
>
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Re: [sympy] Project Idea for GSoC 2018

2018-02-26 Thread Jason Moore
If you'd like to work on symblic analysis of complex numbers you are in the
right spot. You can get started with SymPy here:
https://github.com/sympy/sympy/wiki/GSoC-2018-Student-Instructions

Jason

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On Fri, Feb 23, 2018 at 10:36 PM,  wrote:

> I am a Computer Science and Engineering undergraduate at IIT Jodhpur. I
> prepared a layout for my project idea for consideration by developers at
> SciPy. Ralf Gommers, member of SciPy-dev mailing list, suggested to me to
> present my idea for consideration by developers at SymPy. Whom should I
> contact for discussion of my idea?
>
> I am attaching the layout of the project idea that I sent to the
> developers at SciPy. I will make the suitable changes when suggested by
> mentors.
>
> Waiting for a positive response.
>
>
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Re: [sympy] GSoC 2018: Introducing myself and my willingness to contribute SymPy

2018-02-26 Thread Jason Moore
Jameer,

You should start here:
https://github.com/sympy/sympy/wiki/GSoC-2018-Student-Instructions

Jason

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On Sat, Feb 24, 2018 at 5:24 AM, Jameer Babu  wrote:

> Hi,
>
> I am Jameer, studing Computer Science and Engineering at Amrita School of
> Engineering. Presently,I am in my second year.I am very passionate about
> open source contribution and problem solving. I started contributing SymPy
> which I like the most.I participated in ACM-ICPC regional contest
> representing my college, which grew my confidence.Till now, I was able to
> make patches that passed all the tests by Travis.I would like to do
> project and apply for GSoC from SymPy.
>
> I would like to work on the project "Risch Algorithm for Symbolic
> Integration".
>
> Looking forward for a positive reply.
>
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Re: [sympy] introduction for GSoC 2K18

2018-02-26 Thread Jason Moore
Shubankar,

You should start here:
https://github.com/sympy/sympy/wiki/introduction-to-contributing

Jason

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On Sun, Feb 25, 2018 at 12:43 AM, shubhankar sharma <
shubhankarsharm...@gmail.com> wrote:

> Hey everyone,
>
> I am Shubhankar Sharma.
>
> I am currently pursuing Computer Science Engineering in NIT Hamirpur .
>
> I am an beginner in the field of contributions and open source development.
>
> I have experience in Python, C,C++,Ruby,JavaScript,node.js.
>
> While searching for a good organization in GSoC 2K18 i came across upon
> SymPy, I have good experience in Python and deep interest in the language I
> would love to be a part of this SymPy's developers team.
>
>
>
>
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Re: [sympy] Regarding starting contributing.

2018-02-26 Thread Jason Moore
Aarish,

You can start by reading this document:
https://github.com/sympy/sympy/wiki/introduction-to-contributing

Jason

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On Mon, Feb 26, 2018 at 7:08 AM,  wrote:

> I am Aarish Chhabra, pursuing Btech at IIITDelhi in Computer Science and
> Applied Mathematics and i am currently in my 1st year.I found Sympy very
> interesting and I want to start contributing.I want to know where i would
> get the codes for contribution.
>
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Re: [sympy] GSOC : 2D Beam Solving System

2018-02-26 Thread Jason Moore
Jashanpreet,

All of your ideas sound great. I recommend that you pick a variety of beam
problems and try to solve them with SymPy. That is the best way to come up
with a list of needs to improve things.

Jason

moorepants.info
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On Mon, Feb 26, 2018 at 4:53 AM, Jashan  wrote:

> Hello,
>
> I am Jashan, a second-year undergrad from India. I have been contributing
> to SymPy for more than a month now. While going through Gsoc Ideas page, I
> found 2D Beam Solving System
> 
>  intriguing.
> I had a subject on solid mechanics in my college and I would be pleased if
> I get a chance to work on it this summers.
>
> After going through the previous work, I observed everything desired was
> implemented. I am kinda confused what exactly more is to be needed by this
> module. But still, I have some ideas which I think can be discussed/
> implemented. Currently, beams are considered to be of uniform
> cross-section
>
> and youngs modulus. But I was thinking of problems having multiple beams
> with different parameters welded/attached together.
>
> Also why to get restricted on 2D, I don't know how much complicated it can
> get but we can solve the problems for beams with some thickness and height
> both just by breaking the forces in perpendicular components and adding
> shear forces and deflections vectors. Yeah, this would need the forces to
> input as a vector in the value parameter of  (value, start, order) API and
> we will have to change API of beam module that it should then take two
> moments of area(or area vectors) while initializing.
>
> I don't know how appropriate these ideas are and are they even
> long/important enough to be considered implementing in summers. If these
> are not the desirable changes, what else can be implemented? I would love
> to hear the views of Jason Moore and Sampad Saha as they are way more
> familiar with the project.
>
> Thanks,
> Jashanpreet Singh 
>
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[sympy] Re: Sympy Polynomail Issues

2018-02-26 Thread Leonid Kovalev
Let's start with the expression 

expr = -2.61468835142518e-12*I*x**3 - 1.77367468147515e-13*x**2 + 
2.01551297295763e-14*I*x + 6.13636683162216e-92*1/x**2 - 1.320867768074e-41*
I*1/x + 7.79634921616583e-16

It is not a polynomial in x, because it contains negative powers of x. If 
you force it to be a polynomial with poly(expr), it becomes a polynomial 
with respect to x and 1/x. And that is a multivariate polynomial (x and 1/x 
are like two variables). Hence the error: nroots does not work with 
multivariate polynomials.

Instead, get rid of the negative powers of x first. For example, 

numer, denom = factor(expr).as_numer_denom()

which returns numerator and denominator as a tuple,

(-2.61468835142518e-12*I*x**5 - 1.77367468147515e-13*x**4 + 
2.01551297295763e-14*I*x**3 + 7.79634921616583e-16*x**2 - 1.320867768074e-41
*I*x + 6.13636683162216e-92, 
 x**2)

(The factoring is optional, but helpful in order to get a simpler 
numerator-denominator split). Now, the roots of the original expression are 
the roots of the numerator, except any that are shared with the 
denominator. 

Now we can convert the numerator to a polynomial and use nroots:

p = poly(numer, x)  
p.nroots()

Output: 

[0, 0, -0.0808688047608342 + 0.0115783613847529*I, 0.0446783092911365*I, 
0.0808688047608342 + 0.0115783613847529*I]

which is disappointing because 0 is obviously not a root of the numerator. 
The tiny size of constant term is a problem, it creates some roots that are 
too close to 0 for double-precision computations to discern. We need more 
precision (parameter n), which in turn requires more iterative steps 
(parameter maxsteps). 

p.nroots(n=50, maxsteps=200)

This looks better:

[-0.080868804760834166180018845175030947090976577924994 + 
0.011578361384752871275300055197605686713645998543873*I, -
4.645708662094007114652707243530690040397643132e-51*I, 
1.6942131906240984280655485817471796195769008732488e-26*I, 
0.044678309291136464439409743198239609092604642312342*I, 
0.080868804760834166180018845175030947090976577924994 + 
0.011578361384752871275300055197605686713645998543873*I]





On Monday, February 26, 2018 at 8:42:55 AM UTC-5, k wrote:
>
> Hi 
> I am trying to understand how to simplify a Polynomial in Sympy without 
> any 1/x or 1/x^n terms.
>
> Because solving for roots, the domain won't work with nroots.
>
> The error I get.
>
> MultivariatePolynomialError: can't compute numerical roots of 
> Poly(-2.61468835142518e-12*I*x**3 - '
> 1.77367468147515e-13*x**2 + 2.01551297295763e-14*I*x + 
> 6.13636683162216e-92*1/x**2 - 1.320867768074e-41*I*1/x + 
> 7.79634921616583e-16, x, 1/x, domain='EX')
>
> Any help would be of great assistance.
>
>

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[sympy] GSOC : 2D Beam Solving System

2018-02-26 Thread Jashan
Hello,

I am Jashan, a second-year undergrad from India. I have been contributing 
to SymPy for more than a month now. While going through Gsoc Ideas page, I 
found 2D Beam Solving System 

 intriguing. 
I had a subject on solid mechanics in my college and I would be pleased if 
I get a chance to work on it this summers.

After going through the previous work, I observed everything desired was 
implemented. I am kinda confused what exactly more is to be needed by this 
module. But still, I have some ideas which I think can be discussed/
implemented. Currently, beams are considered to be of uniform cross-section 

and youngs modulus. But I was thinking of problems having multiple beams 
with different parameters welded/attached together.  

Also why to get restricted on 2D, I don't know how much complicated it can 
get but we can solve the problems for beams with some thickness and height 
both just by breaking the forces in perpendicular components and adding 
shear forces and deflections vectors. Yeah, this would need the forces to 
input as a vector in the value parameter of  (value, start, order) API and 
we will have to change API of beam module that it should then take two 
moments of area(or area vectors) while initializing.

I don't know how appropriate these ideas are and are they even 
long/important enough to be considered implementing in summers. If these 
are not the desirable changes, what else can be implemented? I would love 
to hear the views of Jason Moore and Sampad Saha as they are way more 
familiar with the project.

Thanks,
Jashanpreet Singh 

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Re: [sympy] Multivariate Resultants

2018-02-26 Thread Nikoleta-v3
Thank you for your reply Aaron. 
I believe that the multivariate resultants are a good follow up from what 
is already within the library,

I will go ahead and open a pull request.

Kind regards
Nikoleta


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