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julia installation, since the solver is written in Julia and the Python interface is a wrapper over it. This has been tackled in the "latest" code (v0.4.dev0 on GitHub), that removes the Julia dependency but trades Julia's speed for Python's convenience. We are planning to develop the Julia code separately and perhaps have a backend switch, once the codebase matures.
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Hi! I may have found a found a bug in einsteinpy. Either that or I have a fundamental misunderstanding about how to use it. The Riemann curvature tensor should always be skew symmetric: R_abcd = -R_abdc. However in the following example this is not the case. I am working with a 2D metric with line element ds^2 = -2 du dr - K(u, r) du^2:
import sympy
from einsteinpy.symbolic import MetricTensor, RiemannCurvatureTensor
syms= sympy.symbols("u r")
u, r = syms
K = sympy.Function("K")(u, r)
metric_array = [[-K, -1], [-1, 0]]
metric = MetricTensor(metric_array, syms)
rie = RiemannCurvatureTensor.from_metric(metric)
rie = rie.change_config("llll")
rie[0][1][1][0] == -rie[0][1][0][1] # Returns False
The last line should return true for any valid Riemann tensor if I understand correctly, but the R_urru component gives zero. Have I made a mistake or is this a bug? Am I accessing the tensor components incorrectly perhaps?
I seem to run into problems like "cannot import name 'Timelike' from 'einsteinpy.geodesic'. ".
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pip install git+https://github.com/einsteinpy/einsteinpy.git.
pip install einsteinpy. This would install einsteinpy-0.3.1 (AKA "stable"). What you want is einsteinpy-0.4.dev0 (AKA "latest"), that you can install via pip install git+https://github.com/einsteinpy/einsteinpy.git. This pulls the most recent code from our GitHub repo. The documentation for this version can be found at https://docs.einsteinpy.org/en/latest .
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pip uninstall einsteinpy before you install the latest version.
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tandersen@tomm1 bin % ./conda init zsh
no change /opt/homebrew/Caskroom/miniforge/base/condabin/conda
no change /opt/homebrew/Caskroom/miniforge/base/bin/conda
no change /opt/homebrew/Caskroom/miniforge/base/bin/conda-env
no change /opt/homebrew/Caskroom/miniforge/base/bin/activate
no change /opt/homebrew/Caskroom/miniforge/base/bin/deactivate
no change /opt/homebrew/Caskroom/miniforge/base/etc/profile.d/conda.sh
no change /opt/homebrew/Caskroom/miniforge/base/etc/fish/conf.d/conda.fish
no change /opt/homebrew/Caskroom/miniforge/base/shell/condabin/Conda.psm1
no change /opt/homebrew/Caskroom/miniforge/base/shell/condabin/conda-hook.ps1
no change /opt/homebrew/Caskroom/miniforge/base/lib/python3.9/site-packages/xontrib/conda.xsh
no change /opt/homebrew/Caskroom/miniforge/base/etc/profile.d/conda.csh
modified /Users/tandersen/.zshrc
==> For changes to take effect, close and re-open your current shell. <==
tandersen@tomm1 bin % pwd
/opt/homebrew/Caskroom/miniforge/base/bin
Disclaimer: I am coming more from a physics background rather than coding background.
Hi! Sorry for bothering for the very first day, but I noticed that the pip installing is complaining that
einsteinpy requires Python '>=3.7' but the running Python is 2.7.17
while I just installed python 3.8, and also the alias "python" points to that one, so why does it search for the oldest python? How can I force it to choose the 3.8 version I installed?
Processing /project/6004969/mlai92/einsteinpy
Installing collected packages: UNKNOWN
Running setup.py install for UNKNOWN ... error
Complete output from command /usr/bin/python2 -u -c "import setuptools, tokenize;file='/tmp/pip-Ycu7Ai-build/setup.py';exec(compile(getattr(tokenize, 'open', open)(file).read().replace('\r\n', '\n'), file, 'exec'))" install --record /tmp/pip-oH81vU-record/install-record.txt --single-version-externally-managed --compile:
/usr/lib64/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'setup_cfg'
warnings.warn(msg)
running install
running build
running install_egg_info
running egg_info
creating UNKNOWN.egg-info
writing UNKNOWN.egg-info/PKG-INFO
writing top-level names to UNKNOWN.egg-info/top_level.txt
writing dependency_links to UNKNOWN.egg-info/dependency_links.txt
writing manifest file 'UNKNOWN.egg-info/SOURCES.txt'
warning: manifest_maker: standard file '-c' not found
reading manifest file 'UNKNOWN.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching '*.py' under directory 'src/einsteinpy/tests'
warning: no files found matching '*.html' under directory 'src/einsteinpy/tests'
no previously-included directories found matching 'docs/source/examples/.ipynb_checkpoints'
warning: no previously-included files matching '*.py[cod]' found anywhere in distribution
warning: no previously-included files matching '__pycache__' found anywhere in distribution
warning: no previously-included files matching '*.so' found anywhere in distribution
warning: no previously-included files matching '*.dylib' found anywhere in distribution
writing manifest file 'UNKNOWN.egg-info/SOURCES.txt'
Copying UNKNOWN.egg-info to /usr/lib/python2.7/site-packages/UNKNOWN-0.0.0-py2.7.egg-info
error: /usr/lib/python2.7/site-packages/UNKNOWN-0.0.0-py2.7.egg-info: Permission denied
----------------------------------------Command "/usr/bin/python2 -u -c "import setuptools, tokenize;file='/tmp/pip-Ycu7Ai-build/setup.py';exec(compile(getattr(tokenize, 'open', open)(file).read().replace('\r\n', '\n'), file, 'exec'))" install --record /tmp/pip-oH81vU-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-Ycu7Ai-build/