i am having trouble importing covariance function from python statistics.
I get the error-message: ImportError: cannot import name 'covariance'
My version of Python is 3.8.8
I want to use this, not np.cov
thanks in advance
Related
I have a Julia module in which I would like to import the Python function sympy.physics.wigner.wigner_9j. My minimal example module is as follows:
module my_module
using PyCall
using SymPy
export test
test()=sympy.physics.wigner.wigner_9j(1,1,1,1,1,1,1,1,1)
end
Then in my Julia notebook running:
using my_module
test()
gives
KeyError: key :physics not found
However adding to the notebook
#pyimport sympy.physics.wigner as sympy_wigner
sympy_wigner.wigner_9j(1,1,1,1,1,1,1,1,1)
gives the correct output. For some reason using #pyimport inside modules gives errors, which I typically avoid by using an __init__ inside my module, e.g adding to my_module.jl
const camb=PyNULL()
function __init__() # this should probably go in SFBBispectrum.jl
copy!(camb, pyimport_conda("camb", "camb", "conda-forge"))
pars=camb.CAMBparams()
end
which allows me to access camb.CAMBparams. Unfortunately I am failing to do something similar for sympy.physics.wigner.wigner_9j.
It has been awhile, but does this help https://github.com/JuliaPy/SymPy.jl/blob/master/src/physics.jl
I am into a situation where I am able to successfully run the below snippet in azure Databricks from a separate CMD.
%run ./HSCModule
But running into issues when including that piece of code with other scala code which is importing below packages and getting following error.
import java.io.{File, FileInputStream}
import java.text.SimpleDateFormat
import java.util{Calendar, Properties}
import org.apache.spark.SparkException
import org.apache.spark.sql.SparkSession
import scala.collection.JavaConverters._
import scala.util._
ERROR = :168: error: ';' expected but '.' found. %run
./HSCModule
FYI - I have also used dbutils.notebook.run and still facing same issues.
You can't mix the magic commands, like, %run, %pip, etc. with the Scala/Python code in the same cell. Documentation says:
%run must be in a cell by itself, because it runs the entire notebook inline.
So you need to put this magic command into a separate cell.
I'm a beginner at OpenCV, and trying to run an open-source program.
http://asrl.utias.utoronto.ca/code/gpusurf/index.html
I currently have the Computer Vision Toolbox OpenCV Interface 20.1.0 installed and Computer Vision Toolbox 9.2.
I cannot run this simple open-source feature matching algorithm without encountering errors.
import cv2
import matplotlib.pyplot as plt
%matplotlib inline
% read images
img1 = cv2.imread('[INSERT PATH #1]');
img2 = cv2.imread('[INSERT PATH #2]');
img1 = cv2.cvtColor(img1, cv2.COLOR_BGR2GRAY);
img2 = cv2.cvtColor(img2, cv2.COLOR_BGR2GRAY);
%sift
sift = cv2.xfeatures2d.SIFT_create();
keypoints_1, descriptors_1 = sift.detectAndCompute(img1,None);
keypoints_2, descriptors_2 = sift.detectAndCompute(img2,None);
len(keypoints_1), len(keypoints_2)
The following message is returned:
Error: File: Keypoints.m Line: 1 Column: 8
The import statement 'import cv2' cannot be found or cannot be imported. Imported names must end with '.*' or be
fully qualified.
However, when I remove Line 1, I instead get the following error.
Error: File: Keypoints.m Line: 2 Column: 8
The import statement 'import matplotlib.pyplot' cannot be found or cannot be imported. Imported names must end
with '.*' or be fully qualified.
Finally, following the error message only results in a sequence of further errors from the cv2 library. Any ideas?
That's because the code you've used isn't MATLAB code, it's python code.
As per the website you've linked:
From within Matlab
The parallel implementation coded in Matlab can be run by using the surf_find_keypoints() function. The output keypoints can be sorted by strength using surf_best_n_keypoints(), and plotted using surf_plot_keypoints().
Check that you've downloaded the correct files and try again.
Furthermore, the Matlab OpenCV Interface is designed to integrate C++ OpenCV code, not python. Documentations here.
Yes, it is correct that this is Python code. I would recommend checking your dependencies/libraries. The PyCharm IDE is what I personally use since it takes care of all the libraries easily.
If you do end up trying out PyCharm click on the red icon when hovering on CV2. It’ll then give you a prompt to download the library.
Edit:
Using Python some setup can be done. Using pip:
Install opencv-python
pip install opencv-python
Install opencv-contrib-python
pip install opencv-contrib-python
Unfortunately, there is some issue with the sift feature since by default it is excluded from newer free versions of OpenCV.
sift = cv2.xfeatures2d.SIFT_create() not working even though have contrib installed
import cv2
Image_1 = cv2.imread("Image_1.png", cv2.IMREAD_COLOR)
Image_2 = cv2.imread("Image_2.jpg", cv2.IMREAD_COLOR)
Image_1 = cv2.cvtColor(Image_1, cv2.COLOR_BGR2GRAY)
Image_2 = cv2.cvtColor(Image_2, cv2.COLOR_BGR2GRAY)
sift = cv2.SIFT_create()
keypoints_1, descriptors_1 = sift.detectAndCompute(Image_1,None)
keypoints_2, descriptors_2 = sift.detectAndCompute(Image_2,None)
len(keypoints_1), len(keypoints_2)
The error I received:
"/Users/michael/Documents/PYTHON/Test Folder/venv/bin/python" "/Users/michael/Documents/PYTHON/Test Folder/Testing.py"
Traceback (most recent call last):
File "/Users/michael/Documents/PYTHON/Test Folder/Testing.py", line 9, in <module>
sift = cv2.SIFT_create()
AttributeError: module 'cv2.cv2' has no attribute 'SIFT_create'
Process finished with exit code 1
import numpy as np
from statistics import mean
x=[1,2,3,4,5]
y=[6,7,8,9,10]
m=((mean(x)*mean(y)-mean(x*y))/(mean(x)**2)-(mean(x**2)))
print(m)
In the above the(or any other code where I run numpy), Firstly I am getting an input request when running the program. Something like this:
PS D:\Codes\Python> python practice.py
Enter no.: 1
Enter: 1
which should not happen as values are initialized. I saw in other forums regarding how the file should not be named after a Python module(which you can see, it isn't). Even after that I'm getting error:
"C:\Users\KIIT\AppData\Local\Programs\Python\Python36\lib\logging\__init__.py", line 28, in <module>
from string import Template
ImportError: cannot import name 'Template'
Can someone please tell me what to do about it?
Edit:
This problem is only powershell centric. The problem is faced when I run program through powershell. It works fine in IDLE.
There must be a file named "string.py" in your D:\Codes\Python.
You can rename it to solve this issue.
You should not name the file to the modules in Python Standard Library.
I have an GUI-based (TraitsUI/PyQt/Envisage) application written in Python. I would like to spawn an IPython Notebook in which I expose a small API and a number of objects. Those objects include a SQLAlchemy session and a bunch of SQLAlchemy models.
I've looked a lot, but I can't find any examples of this. I can start a notebook:
from IPython.frontend.html.notebook import notebookapp
app = notebookapp.NotebookApp.instance()
app.initialize()
app.start()
and that works well enough (although I'd prefer if 'start' was nonblocking... I assume I can do it in another thread if needed), but I can't alter the namespace.
I've also found examples like this:
from IPython.zmq.ipkernel import IPKernelApp
namespace = dict(z=1010)
kapp = IPKernelApp.instance()
kapp.initialize()
# Update the ns we want with special variables auto-created by the kernel
namespace.update(kapp.shell.user_ns)
# Now set the kernel's ns to be ours
kapp.shell.user_ns = namespace
kapp.start()
But I'm not sure how to actually open the Notebook from here.
Does anybody have any suggestions?
Thanks!
>>> import IPython
>>> z=1010
>>> IPython.embed()
Python 3.5.2 (default, Oct 8 2019, 13:06:37)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.9.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: z
Out[1]: 1010