https://github.com/stsievert/python-drawnow
MATLAB-like drawnow to easily update a figure
https://github.com/stsievert/python-drawnow
python visualization
Last synced: about 1 year ago
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MATLAB-like drawnow to easily update a figure
- Host: GitHub
- URL: https://github.com/stsievert/python-drawnow
- Owner: stsievert
- Created: 2014-04-11T19:30:12.000Z (about 12 years ago)
- Default Branch: master
- Last Pushed: 2020-05-17T02:21:07.000Z (about 6 years ago)
- Last Synced: 2025-06-09T02:09:36.061Z (about 1 year ago)
- Topics: python, visualization
- Language: Python
- Homepage:
- Size: 2.92 MB
- Stars: 106
- Watchers: 10
- Forks: 15
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
`drawnow` for matplotlib
========================
The scientific community often runs iterative code, often in the form of
simulation. It's often useful to see the results after each iteration.
Accordingly, MATLAB® has a nice feature that allows you to update the
figure, `drawnow`. This repo brings the same feature to Python's
matplotlib, with some extras.
Example:
This is shown with `imshow`, but python-drawnow allows updates of any
figure.
Usage:
``` python
# complete implementation of script found in test/test.py
from pylab import *
from drawnow import drawnow, figure
# if global namespace, import plt.figure before drawnow.figure
def approx(x, k):
"""Approximate x with k singular values"""
...
figure(figsize=(7, 7/2))
def draw_fig():
subplot(1, 2, 1)
imshow(x)
subplot(1, 2, 2)
imshow(x_hat)
#show()
x = imread('test-data/mandrill.png').mean(axis=2)
k_values = around(logspace(0, 2, num=10))
for k in k_values:
x_hat = approx(x, k)
drawnow(draw_fig)
```
Documentation
=============
If you want to wait for confirmation after update or the option to drop
into a debugger, call `drawnow(function_to_draw_figure, confirm=True)`.
If you only want to show the figure once, call
`drawnow(function_to_draw_figure, show_once=True)`. The full
documentation is included in the doc strings. Use `drawnow?` or
`help(drawnow)` to see these docs.
Jupyter/Spyder
==============
Try running the folloowing code in a Jupyter input cell/in the
console/etc:
```
%matplotlib
```
This will disable the Matplotlin inline mode and use the default
plotting backend. For more detail, see the [IPython plotting
documentation](https://ipython.readthedocs.io/en/stable/interactive/plotting.html#id1).
Installation
============
Two options:
1. Run `pip install drawnow`.
2. Download this repository and run `python setup.py install`.
Option 2 assumes a working Python installation with `pip`. I suggest
Anaconda's distribution: For
other options, see .
Changes to code
---------------
This does require *small* changes to your code. All it should really
amount to is moving `figure(); plot(...); show()` inside a function; not
much.