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
I guess it's because
Add does the smart substitution but Symbol does not
The cosine is irrelevant. It's the same with
x.subs(x - 1, y) vs. (x + 1).subs(x - 1, y)
So
Symbol._eval_subs should do the same thing as Add._eval_subs.
@asmeurer: I am somewhat confused regarding the simplification. Apparently there is a difference between
simplify(a_list) and [simplify(element) for element in a_list]. With the latter, I get the same expressions as in Mathematica, the former does not simplify at all o_O. In any case: thanks for opening the issue :-)
It's a bit unclear in the docstring. I take it they are being represented as radius vectors from the origin along the major & minor axis ?
I have some basic level knowledge in Python, FLINT, NumPy
@akshit1511 Hi, i am also new, i'll tell you what i'll be doing to get started, first of all i'll learn to use git and github and then https://github.com/sympy/sympy/wiki has a lot of information on how to start
@akshit1511 Tell me if i am missing something.
I'm trying to hunt down where in my code I'm using a now deprecated sympy function. I'm using pytest & python 3.7 and I'm looking at the python docs. This should work, but I can't seem to make it trigger:
$ PYTHONWARNINGS='ignore,error:::sympy' PYTHON=python3.7 PYTHONPATH=~/vc/sympy ./scripts/run_tests.sh chempy/util/pyutil.py
==== 6 passed, 1 skipped in 0.53 seconds ====
/home/bjorn/vc/sympy/sympy/matrices/matrices.py:2491: SymPyDeprecationWarning:
Dot product of non row/column vectors has been deprecated since SymPy
1.2. Use * to take matrix products instead. See
https://github.com/sympy/sympy/issues/13815 for more info.
useinstead="* to take matrix products").warn()if I change the PYTHONWARNINGS environment variable to simply error::DeprecationWarning it triggers way before actually running the tests:
Traceback (most recent call last):
...
File "/opt/py37/lib/python3.7/site-packages/_pytest/assertion/rewrite.py", line 6, in <module>
import imp
File "/opt/py37/lib/python3.7/imp.py", line 33, in <module>
DeprecationWarning, stacklevel=2)
DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative usesdoes anyone know the proper syntax to specifically turn SymPy warnings into errors?
(I also tried
PYTHONWARNINGS='ignore,error::DeprecationWarning:sympy' and a few other combinations to no avail)
I guess you'll have to use that and run the tests from within Python.
Ok apparently you have to specify warnings from external modules with a module name, like
sympy.SymPyDeprecationWarning
But it looks like it doesn't work because you have to import it from sympy.utilities.exceptions.
And
-W"error::sympy.utilities.exceptions.SymPyDeprecationWarning" gives Invalid -W option ignored: invalid module name: 'sympy.utilities.exceptions'
Maybe I'm doing it wrong.
I don't know. Based on the code from https://github.com/python/cpython/blob/3.7/Lib/warnings.py#L239,
-W"error::sympy.utilities.exceptions.SymPyDeprecationWarning" should work
Does it work for you?
Hello, everyone ! I was going through the workflow & came across the guidelines for writing commit messages. sympy/sympy@bf0e81e
Is it really necessary to write an example for the commit message ?
I understand the description is important.
Hello everyone.My name is Ayushman Koul and I am a 3rd year student studying Computer Engineering at GCET Jammu. I wish to participate in GSOC 2019 through Sympy and contribute to the community as much as I can.@hetp111 From my personal experience I would suggest you to take https://in.udacity.com/course/how-to-use-git-and-github--ud775-india course to have better understanding .
@asmeurer Sir I am interested in working on this project idea Please provide me the guidance how should I proceed further on this project.
@ayushmankoul It seems to me that the project idea text is outdated. Most of it has already been implemented in the
factortools module except what is suggested in the last sentence: "You can go further and extend...". Algorithms for that part may not be easily available in the literature, if at all.