sympy/sympy

A computer algebra system written in pure Python http://sympy.org/ . To get started to with contributing https://github.com/sympy/sympy/wiki/Introduction-to-contributing

Matthew Roos

@mattroos

Thanks, @naveensaigit! I'm learning a lot about sympy from that single example!

Gaurav Dhingra

@gxyd

Hi @asmeurer , any expected date by when can we see the SymPy 1.9 coming out?

Fabio Luporini

@FabioLuporini_twitter

Hi everyone! How can I enforce precedence on the Mod in a*(b%3) where a and b are plain Symbol ? SymPy will evaluate it to a*Mod(b, 3), while I'd want to keep the precedence explicit (so that ultimately generation of lower level code honours this user-enforced precedence)

Oscar Benjamin

@oscarbenjamin

You can enforce precedence with brackets as you showed.

13 replies

mostlyaman

@mostlyaman

Hi everyone! Can anyone verify that my release notes for sympy/sympy#21553 are acceptable so that I can add them manually to the wiki. The PR has been closed now. Thanks!

Aaron Meurer

@asmeurer

@mostlyaman yes they look good

mostlyaman

@mostlyaman

@asmeurer Thanks! Added them to the wiki.

Shamitha

@ShamithaReddy

Hi everyone, can anyone say why this isn't working. p=lambda x: x*2, Range(n)

1 reply

p(3), this is giving error-- Traceback (most recent call last):
File "<string>", line 1, in <module>
TypeError: 'tuple' object is not callable

I'm new to sympy, can anyone help

sharath sr

@Sharath-a26

Hello guys, i'm interested to work on this project, Can someone guide me?

ASUTOSH GHANTO

@asutoshgha

how to actually contribute to this repository?

what additional features we can add?

Akhil (#stayhome #staysafe )

@AkhilBollu_twitter

Hello everyone

Is anyone there??

Shamitha

@ShamithaReddy

YUP @AkhilBollu_twitter

ASUTOSH GHANTO

@asutoshgha

please help

I want to improve

Miguel Guthridge

@MiguelGuthridge

Is there a way for me to include sympy as a module in another project so that I can import it inside an interpreter where pip installing modules isn't accessible?

2 replies

I'm trying to make an extension to a search program that uses python so that when you type eq [some equation] it'll solve it

But since I've never included a package without having it pip installed, I'm not entirely sure where to start haha

shashankks0987

@shashankks0987

My test is returning this as the expected output Complement(Integers, ConditionSet(n, Eq((n - 1)*(n + 1), 0), Integers)). I need to convert this to 'sympy' form. Need help

oponkork

@oponkork

Why does the following latex code of the function varies from the symbol?

import sympy as sp
r = sp.symbols("r")
print(sp.latex(sp.symbols("\delta\ u_t")))
print(sp.latex(sp.Function("\delta\ u_t")(r)))

gives

\delta u_{t}
\delta\ u_{t}{\left(r \right)}

Notice that the space right after \delta is escaped for the function, but not for the symbol.

Aaron Meurer

@asmeurer

The latex printer uses different code paths for Symbol and Function. They should probably be made uniform. By the way, you should always use raw strings for latex, like r"\delta\ u_t".

oponkork

@oponkork

Okay, is there a way I can use the Symbol-like expressions for functions, or define the symbol without the space? The way it gets displayed, it appears as if \delta and u_t are two different variables. Ofcourse, sp.symbols("\deltau_t"), it won't work.

Also, why raw strings for latex?

Kalevi Suominen

@jksuom

why raw strings for latex?

Otherwise double backslash will be needed like \\delta.

oponkork

@oponkork

why raw strings for latex?

Otherwise double backslash will be needed like \\delta.

But sp.symbols("\delta\ u_t") works.

Kalevi Suominen

@jksuom

It seems to work, apparently because \d is not an escape sequence in Python. However, \b is an escape sequence:

>>> "\beta\ u_t"
'\x08eta\\ u_t'

oponkork

@oponkork

Aah okay. \theta won't work either then. Thanks a lot.

Okay, is there a way I can use the Symbol-like expressions for functions, or define the symbol without the space? The way it gets displayed, it appears as if \delta and u_t are two different variables. Ofcourse, sp.symbols("\deltau_t"), it won't work.
Also, why raw strings for latex?

Any solution for this?

Arun sanganal

@ArunSanganal

Hello! I am a freshman from IIT Kharagpur, new to sympy. Hoping to get along with this awesome community. Cheers!😄

wolfgang_302

@wolfgang-302

Maybe someone can explain the following to me:
Using sympy 1.7.1 i get the following:

from sympy import *
init_printing()

a = Symbol('a')

a0, = solveset(Eq(2*a**5,0.34),domain=S.Reals)
a0 # 0.70160032942779
0.70160032942779

print(a0.round(4)) # 0.7016
print(a0.round(4).n(10)) # 0.7015991211

Thank you for any hints.
Wolfgang

Felix

@flxai:matrix.org

[m]

Hi! 👋 I have a sympy expression and want to iterate over elements of its syntax tree. Can somebody please point me to the right direction?

Nevermind. I just found it myself: docs.sympy.org/latest/tutorial/manipulation.html#recursing-through-an-expression-tree

moiseszeleny

@moiseszeleny

@flxai:matrix.org hi you can use the args method, for example if you expression is 'expr' you can iterate on its elements by '[arg for arg in expr.args]'.

Felix

@flxai:matrix.org

[m]

moiseszeleny-5dd0d487d73408ce4fd13ecb: Thanks. That's what I'm doing. Just recursively

latot

@latot:matrix.org

[m]

Hi hi, can someone help me with a little thing plis?

I'm having a very hard time trying to get the memory usage of sympy expressions, actually for example, sys.getsizeof always return 64 bytes, even if the var have 200 bytes in the name...., just the name...., how can I get the actual memoery usage of a expression?

Felix

@flxai:matrix.org

[m]

latot: You could try something like this: ix.io/3q9z

oytis

@oytis:matrix.org

[m]

Sorry, a very general question, I'm just looking around with sympy.

I was confused by sympy having two implementations of vectors, sympy.vector an sympy.physics.vector. They seem to not be sharing code and the documentation for either doesn't mention another one and the reason to have them separate. Why is that? Is there a way to make them interoperate?

Thanks!

1 reply

Miguel Guthridge

@MiguelGuthridge

I've been making a maths interpreter using sympy, and I'm trying to implement simultaneous equations, but I'm getting a cannot determine truth value of Relational error when I try to solve them

It's parsing the equations as being semicolon seperated, then recursively generating a sympy expression for them

For the = I'm using sym.Eq(a, b)

And then once I've got everything simplified as much as possible, it uses sym.solve() with a list of the expressions

Which is where the error occurs

Miguel Guthridge

@MiguelGuthridge

Ok nevermind it turns out that sympy doesn't work well with prettyprinting so I just had to stringify it first

AlphaVictorDelta

@AlphaVictorDelta

Hey guys,
My name is Adarsh V. Desai. I am an aspiring software developer. I would like to be a part of sympy and take my skills to the next level by learning new technologies while being an active contributor. I have already installed sympy (developer version) on my local system. Could you guys please point me towards what I should do next to become an active contributor and also understand the code base?
Thank you.

flxai

@flxai:matrix.org

[m]

You could help solving issues, prioritizing bugs: https://github.com/sympy/sympy/issues

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