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
2 replies
According to the docs it depends on the expression to be simplified. You might need to provide some assumptions for your symbols and in general avoid simplify() if cost is a concern.
Hi all,
I'm trying to use SymPy's parse_latex function to parse mixed-fractions. But the issue that's happening is, the tree representation of mixed-fraction is same as if the integer part of mixed fraction were getting multiplied with fractional part of the mixed fraction.
Minimal code example:
>>> from sympy.parsing.latex import parse_latex
>>> from sympy import srepr
>>> e1 = "1 \\frac{1}{3}"
>>> e2 = "1 \\times \\frac{1}{3}"
>>> expr1 = parse_latex(e1)
>>> expr2 = parse_latex(e2)
>>> print(srepr(expr1))
Mul(Integer(1), Pow(Integer(3), Integer(-1)))
>>> print(srepr(expr2))
Mul(Integer(1), Pow(Integer(3), Integer(-1)))
>>> srepr(expr1) == srepr(expr2)
True(possible solution): Is writing a transformation rule the best possible solution to tackle this? https://docs.sympy.org/latest/modules/parsing.html#parsing-transformations-reference
My Gsoc proposal (Improving series Expansions and Limit Computations) is almost about complete (just 3- 4 code snippets need to be added and I'm just finalizing them and some reframing if any ). I've received a basic review from the potential Mentor and also a decent to good review from the potential co-mentor . I would like to request for a second iteration of reviews from the org members and members related to the series/limits module in particular .
The proposal is exhaustive enough for a 175 hour project, to leave some room for bug fixes and implementations if I finish early . Hence I would also like to request if the members could validate the timeline proposed as that was a bit confusing for me to frame . Also now Gsoc projects can be extended to 22 weeks (midway) than the standard 12 week project , so like how do I consider or integrate this if required with the proposed timeline in my proposal?
The link to the proposal is https://docs.google.com/document/d/1Cx7IaAkmxp1f81efSPNpMtkNE6K4NgkhkI_2TLjTEE8/edit#
All suggestions are welcome
It does seem do-able but i might need a little guidance with it
Folks I have a expression I don't know how to simplify:
from sympy import *
from sympy.abc import w, x, y, z
expr = (w - x) * (x - y) + (y - z) * (z - w)
expanded = expand(expr)
back = factor(expr)I want back to be something similar to expr. I tried factor/simplify/cancel and stuff and seems non of these works.
Anyone know what should I try?
Hi @jagt factor() takes a polynomial and factors it into irreducible factors over the rational numbers. Note: factors may not be irreducible if the input is no longer a polynomial over the rationals.
To confirm what will be the factors you can do the following:factor_list() instead of factor which will return the expected factors or output of factor() in a more structured way.
Hi all, I had a quick question on covariance calculations. I'm no expert, but for some reason Sympy is different than what I'd expect. I'm probably using the wrong function somewhere. Here is a quick snippet:
covariance(FiniteRV('Jimmy', density={-.20: .40, .30: .60}), FiniteRV('Walter', density={.40: .40, -.20: .60}))
# expect -0.072And the equation I'm using: https://wikimedia.org/api/rest_v1/media/math/render/svg/18143cb5b668ff2cc739385a5916d9317bb74df0
sympy is at finding the angle between lines that are given in terms of points with symbolic coordinates. Is there a flag to disable symbolic computation across all sympy objects? Having to remember to call .evalf() is far from ideal... I had to spend a great deal of time understanding why my code was running incredibly slow.
The following code plots the graph of a simple piecewise-constant function f
such that f(x) = 1 for x between 0 and 1
and f(x) = -1 for x between 1 and 2
and f(x) = 0 otherwise.
In this plot, the graph is plotted for x between -1 and 3.
However, vertical lines are drawn at the values of x where there are discontinuities.
Is there a way to plot the graph of this function such that the vertical lines (which should not be part of the graph) are not drawn?
from sympy import symbols
from sympy.plotting import plot
from sympy import Piecewise
x = symbols('x')
s = Piecewise((1, (x >= 0) & (x <= 1)), (-1, (x >= 1) & (x <= 2)), (0, True))
plot(s,(x,-1,3))
My name is Saksham(19), I am a first-year computer science student who has just ventured into open source. Sympy intrigued me as it is a python based alternative to MATLAB which has been a little irritating to use in my college coursework.
I have some experience in python and have built bots and projects using different libraries but have never worked on something of this size. I am hoping to find some lead here to see what to work on and where to learn the required prerequisites for that. Please guide me regarding this matter. Also, I would be giving this work first priority after my internals ends in 5 days.
Thanks
PS... My first PR got merged
https://github.blog/2022-05-19-math-support-in-markdown/
