I am having problems trying to make matplotlib plot a function without blocking execution. I have tried using show(block=False) as some people suggest, but all I get is a frozen window. If I simply call show(), the result is plotted properly but execution is blocked until the window is closed. From other thre…
Tag: python
Calculating angles between line segments (Python) with math.atan2
I am working on a spatial analysis problem and part of this workflow is to calculate the angle between connected line segments. Each line segment is composed of only two points, and each point has a pair of XY coordinates (Cartesian). Here is the image from GeoGebra. I am always interested in getting a positi…
Unable to locate package virtualenv in ubuntu-13 on a virtual-machine
When i try to run the command: sudo apt-get install virtualenv The error I get in response is: E: Unable to locate package virtualenv Answer Try This :
Python Pandas Setting Dataframe index and Column names from an array
Lets say I have data loaded from an spreadsheet: and I have a the names in another dataframe for the rows and the columns for example Is there a way I can set the values in colnames[‘Names’].value as the index for df? and is there a way to do this for column names? Answer How about df.index = coln…
Pandas dataframe.dot division method
I am trying to divide two series of different length to return the matrix product dataframe of them. I can multiply them using the dot method (from this answer): I’ve tried the div method, but this just fills the dataframe with NaNs: Likewise the standard division operator also returns the same result: …
How to show query parameter options in Django REST Framework – Swagger
This has been bugging me for a while now. My ultimate goal is to show query parameter options inside SwaggerUI and give a form input for each query parameter. Similar to how it is displayed when providing a serializer for POST. I am using a viewset which inherits from GenericViewSet and I have tried the follo…
ObsPy Plot Beachball in Time Series
I am trying to plot an ObsPy (or any python) seismic focal mechanism in time series. When using an integer/float series for x it works fine, but the time series fails here: The function xy2patch in the source code is trying to scale the time by a float value. Any ideas? Hack the source? Other packages? Thanks…
Removing pixels surrounded by white pixels OpenCV
I have a black and white image which has a lot of noise. I would like to remove only black pixels that are completely surrounded by white ones. I tried doing so with Filter2d, but I could not achieve it. Answer I’d use a convolution (again) 1: As you can see, the result array has changed all “blac…
ImportError No module named pyaudio
I am writing a program in Python on RaspberryPi, But I am getting an error After that I tried but again get another Can you please guide me that how do I install PyAudio in RaspberryPi Answer Remove the directory PyAudio which already presen in /home/pi and then try these steps or also you can try this let us…
tweepy error response status code 400
I’m trying to write a simple twitter bot using python and tweepy. The code is as follows: I get the following error: I would like some info on how to avoid this error Answer This may be a bug that emerged in the 3.2.0 release of Tweepy. See this issue opened on GitHub. In that issue, TylerGlaiel notes t…