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##### Activity
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namannimmo10 on master

Update example. Merge pull request #21820 from … (compare)

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• Aug 03 18:01
akshanshbhatt opened #21820
Shivam Sundram
@RATED-R-SUNDRAM
hi everyone I am shivam sudram , 2nd year undergraduate at IIT Mandi , i would like to contribute to this org. Any guidance related to where to begin my cotributions and work flow would be very helpful
Anurag-Chevendra
@Anurag-Chevendra
Heyy, I'm Anurag Chevendra, a sophomore at VJTI Mumbai. I really liked this org and would love to start contributing. Can anyone help me out so as from where to start? Thank you.
ayushi-get
@ayushi-get
Hey I am Ayushi Rawat , 2nd year undergraduate and would really love to start my open source journey with this community.
Thank you
Suryam Arnav Kalra
@suryam35
Hi @RATED-R-SUNDRAM @Anurag-Chevendra @ayushi-get , you can start with https://github.com/sympy/sympy/wiki/Introduction-to-contributing for starters, and then you can refer to the docs https://docs.sympy.org/latest/index.html. For the later part, refer to https://github.com/sympy/sympy/wiki/Development-workflow.
Aaron Stiff
@AaronStiff
What does expr.p do?
Naveen Sai
@naveensaigit
@AaronStiff It gives the numerator, but it is only available for Rational as far as I know.
>>> a=Rational(1, 3)
>>> a.p
1
>>> a.q
3
Vaibhav Bhat
@VBhat97
Hey! Are there any steps mentioned anywhere about setting up sympy live locally?
Sidharth Mundhra
@0sidharth
Hey, I believe sympy/sympy#12791 can be closed
zabuja
@zabuja
Hey guys, my name is Atanu Ghosh. I am currently a fresher at TMSL Kolkata. I had never contributed before but would surely like to contribute to this organisation and be part of this great open source community. Please guide me. ThankYou.
kirk86
@kirk86

Would it make sense in the following scenario:

X = sympy.symbols('x', real=True, positive=True)
stats.E(X)
x

stats.E(*) to output Integral of X dP for some probability space Ω,Σ,P instead of just x?

10 replies
Anurag-Chevendra
@Anurag-Chevendra
@suryam35 heyy, thank you! on it.
JP
@JP1128
I'm having problem with processing latex string into latex image using the preview function cause I can't get to install the latex program in Heroku. Does anyone know how to fix this problem?
Constantin Mateescu

Greetings! A while ago I played around with the LaTeX grammar (https://github.com/sympy/sympy/blob/master/sympy/parsing/latex/LaTeX.g4) and added support for complex conjugates to my dev version of sympy. The modification was really simple and only involved adding \overline to the grammar file, regenerating the classes via antlr along with some other small changes to _parse_latex_antlr.py.

Having the ability to compute arbitrary expressions with complex conjugates is really great for the application I'm building. For example, the return value of parse_expr(str(parse_latex('\overline{3 + 4I}'))) would be 3 - 4*I, as expected.

That being said, I was thinking about submitting a PR with this change, but wanted to check with the maintainers of sympy whether this feature makes sense or not. @asmeurer: What do you think?

oponkork
@oponkork

hi all,

say I have a horrible expression of the form X + sqrt(Y + iZ) where X, Y, Z are some expressions. Can I give sympy this form and ask it to collect X,Y,Z in new variables. Something like

A,B,C = some_collect_function((a**2+b**2)+sqrt((a*b*c)+i(a*d)) should set A = a**2+b**2, B = a*b*c and C=a*d.

Aaron Meurer
@asmeurer
@costica1234_twitter yes I think it would be useful. Any improvement to the LaTeX parser is good as long as it is a fairly standard way of representing something
I'm hoping we can move to Lark, which will make these kinds of improvements much easier to make. But the PR for it has stalled sympy/sympy#19825
AbhishekS78
@AbhishekS78_gitlab
Hello all,
I'm Abhishek Sontakke, a second-year UG student at IIT Bombay.
I sent a personal introduction mail on the Sympy mailing list yesterday, but it still hasn't been posted.
Can anyone please moderate it, so it can be posted?
Or should I send it one more time?
Sidharth Mundhra
@0sidharth

I am working on reviving an Old PR, and I am facing an issue - _eval_nseries in Function is returning an undesirable form. Specifically, when _eval_nseries calls _eval_aseries(L697 in function.py), adding a print statement says the asymptotic series being returned is
-(_x - _x**3/2 + 3*_x**5/4 + O(_x**6))*exp(-1/_x**2)/sqrt(pi) + 1
which is what I am expecting, but on returning this expressions changes to
1 + O(x**(-6), (x, oo))
I think the answer sympy is finally returning is wrongly simplified and the original expression is better. This conversion is happening in _eval_nseries of Expr (L3027 in expr.py), where collect(s1, x) outputs the original expression but collect(s1, x) + o is outputting the changed expression.

If anyone can help in getting sympy to output the original expression, it would be greatly appreciated. If this is indeed an undesirable simplification, is it a bug?

Master Grey
@mastergrey
@AbhishekS78_gitlab Sure i'll do that.
Sayandip Halder
@sayandip18
How do I profile sympy code?
basic-programmer-python
@basic-programmer-python
hey Everyone!
I am A Athithya Ithaya (u can simply call me Adi)
I have sent a introduction mail as well as request for guidance for GSOC in mailing list yesterday so I request to post it ...! @AbhishekS78_gitlab
oponkork
@oponkork

hi all,

say I have a horrible expression of the form X + sqrt(Y + iZ) where X, Y, Z are some expressions. Can I give sympy this form and ask it to collect X,Y,Z in new variables. Something like

A,B,C = some_collect_function((a**2+b**2)+sqrt((a*b*c)+i(a*d)) should set A = a**2+b**2, B = a*b*c and C=a*d.

Anything on this?

Constantin Mateescu

@costica1234_twitter yes I think it would be useful. Any improvement to the LaTeX parser is good as long as it is a fairly standard way of representing something

I've just created the PR with support for \overline here: sympy/sympy#20900.

Jim Dupont
@jmikedupont2_gitlab
Howdy
Looking for a mathml xml parser in python, i found sympy has output, any parses?
Benoit Martin
@metabsd
Hi, I'm new with Sympy. Can someone assist me to sympy this. Thx!
Constantin Mateescu
Welcome to Sympy, @metabsd! Here's a code snippet that you can use:
>>> from sympy.abc import x, y
>>> e = (49 * x**2 - 42 * x * y + 9 * y**2) * (7 * x + 3 * y) / (7 * x - 3 * y)
>>> e.subs({x: 1, y: 2})
13
Constantin Mateescu
Here's something else that you can do:
>>> from sympy.parsing.sympy_parser import (parse_expr, standard_transformations, implicit_multiplication_application, convert_xor)
>>>
>>> def parse_plain_text(e, local_dict=None):
...     return parse_expr(
...         e,
...         local_dict=local_dict,
...         transformations=(standard_transformations + (implicit_multiplication_application, convert_xor)),
...         evaluate=False)
...
>>> e = parse_plain_text("(49x^2 - 42xy + 9y^2) (7x + 3y) / (7x - 3y)")
>>> e
(7*x + 3*y)*(49*x**2 - 42*x*y + 9*y**2)/(7*x - 3*y)
>>> e.subs({x: 1, y: 2})
13
Benoit Martin
@metabsd
Benoit Martin
@metabsd
What happen when I use solve(e) ? The result == [{x: -3*y/7}]
This is the normal solving .
Constantin Mateescu
I'm not sure if you can end up with the intermediate form you highlighted as e.subs({x: -3 * y / 7}) will simply return 0.
Neel Gorasiya
@Neel2904
how to set up development environment for sympy in local machine??
Ayush Bisht
@ayushbisht2001
hello everyone, My name is Ayush Bisht and I would like to join this amazing community . Can please , anyone help me, from where to start first so that I get well acquainted with the software and can contribute here.
Ayush Bisht
@ayushbisht2001
can we do some changes to Sympy live shell also ?
Aaron Stiff
@AaronStiff
What is the standard syntax for subscripted variables? x1 or x_1. Either seems to work in most cases, but only underscored subscripts seem to work in all cases (#19005)
Aaron Meurer
@asmeurer
@oponkork your best bet is to substitute the expressions for dummy variables with subs, call collect, then substitute back
Muhammed Ali
@khabdrick
Hello everyone, I am new to sympy, was going through the docs and I saw a lot of maths, can someone please tell me the basic math principles I need to know before I can be comfortable contributing to the project
Francesco
@cescofran_gitlab
Hi There, I'm studying a little the source and I have some questions ..I will ask them one at the time...
1. Why Float are called Float and not Reals? Float seam to refer rather to floating point which by definitions are approximation
but sympy Float seam to have arbitrary precision..
Isuru Fernando
@isuruf
@cescofran_gitlab, they are still floating point numbers, because they have a limited number of digits in the mantissa which is determined at instantiation time.
Francesco
@cescofran_gitlab
Thanks you very much @isuruf ! I see you cannot instantiate any real number just by value ... since that will need infinite memory.
But since still you can have arbitrary precision I felt a little confused in Float nomenclature....
Isuru Fernando
@isuruf
arbitrary precision integers and arbitrary precision floats are two entirely different beasts
with integers, you only need a finite amount of memory
with integer operations, integers can get bigger and the size grows as expected
with reals, you need infinite memory at the start
otherwise you get floats
Francesco
@cescofran_gitlab
so is common to refer to floats as arbitrary precision floats?
Isuru Fernando
@isuruf
I didn't get that part
20 replies