Dear Anton,
Thanks, I have added the lines into the script, and it is:
import kwant
import scipy.sparse.linalg
import scipy.linalg
import numpy as np
import matplotlib as mpl
from matplotlib import pyplot as plt
import sympy
from kwant.continuum.discretizer import discretize,discretize_symbolic,
build_discretized
from kwant.continuum._common import sympify, lambdify
from kwant.continuum._common import momentum_operators, position_operators
The information I got:
Traceback (most recent call last):
File "C:\Python36\lib\site-packages\sympy\__init__.py", line 18, in
<module>
import mpmath
ModuleNotFoundError: No module named 'mpmath'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\QingtianZhang\Desktop\discretize(1).py", line 20, in
<module>
import sympy
File "C:\Python36\lib\site-packages\sympy\__init__.py", line 20, in
<module>
raise ImportError("SymPy now depends on mpmath as an external library. "
ImportError: SymPy now depends on mpmath as an external library. See
http://docs.sympy.org/latest/install.html#mpmath for more information.
I have installed Kwant1.3 on my laptop and got the same error message for
tutorial 2.10.
Best,
Qingtian
2017-06-11 22:26 GMT+08:00 Anton Akhmerov <anton.akhmerov...@gmail.com>:
> Dear Qingtian,
>
> This is very weird. Can you please try running a script with the
> following lines:
>
> import sympy
> from kwant.continuum.discretizer import discretize,
> discretize_symbolic, build_discretized
> from kwant.continuum._common import sympify, lambdify
> from kwant.continuum._common import momentum_operators, position_operators
>
> If I understand correctly, these should fail with a more informative error.
>
> Best,
> Anton
>
> On Thu, Jun 8, 2017 at 10:30 AM, Qingtian Zhang
> <qtzh...@mail.ustc.edu.cn> wrote:
> > Dear all,
> > I have installed Kwant 1.3 on my computer according to the instructions,
> > but i got some error message when i ran the source code for tutorial
> 2.10. I
> > can run all the other source codes for tutorials 2.7-2.9. The information
> > for my pc is: Microsoft Windows 7， 64-bit. Python 3.6.
> >
> > The message I got:
> > Traceback (most recent call last):
> > File "C:\Users\QingtianZhang\Desktop\discretize(1).py", line 196, in
> > <module>
> > main()
> > File "C:\Users\QingtianZhang\Desktop\discretize(1).py", line 183, in
> main
> > template = kwant.continuum.discretize('k_x * A(x) * k_x')
> > File "C:\Python36\lib\site-packages\kwant\_common.py", line 61, in
> > __getattr__
> > raise RuntimeError(msg.format(self.name, self.dependencies))
> > RuntimeError: 'kwant.continuum' is not available because one or more of
> the
> > following dependencies are not installed: sympy
> >
> > I have downloaded 13 packages and installed all of them using pip:
> > cycler-0.10.0-py2.py3-none-any
> > kwant-1.3.1-cp36-cp36m-win_amd64
> > matplotlib-2.0.2-cp36-cp36m-win_amd64
> > numpy-1.13.0rc2+mkl-cp36-cp36m-win_amd64
> > pyparsing-2.2.0-py2.py3-none-any
> > pytest-3.1.1-py2.py3-none-any
> > python_dateutil-2.6.0-py2.py3-none-any
> > pytz-2017.2-py2.py3-none-any
> > scipy-0.19.0-cp36-cp36m-win_amd64
> > setuptools-35.0.2-py2.py3-none-any
> > six-1.10.0-py2.py3-none-any
> > sympy-1.0-py2.py3-none-any
> > tinyarray-1.2.0-cp36-cp36m-win_amd64
> >
> > I have tried to install sympy again using:
> > C:\Users\QingtianZhang>cd c:\Kwant13
> > c:\Kwant13>pip3 install --no-deps sympy-1.0-py2.py3-none-any.whl
> > Requirement already satisfied: sympy==1.0 from
> file:///C:/Kwant13/sympy-1.0-
> > py2.
> > py3-none-any.whl in c:\python36\lib\site-packages
> >
> > It shows that i have already installed sympy.
> > How to fix this?
> > Sincerely,
> > Qingtian Zhang
> >
> >
> >
>
