Python, Matplotlib, subplot: How to set the axis range?
You have pylab.ylim: Note: The command has to be executed after the plot! Update 2021Since the use of pylab is now strongly discouraged by matplotlib, you should instead use pyplot:
matplotlib
How can I set the ‘backend’ in matplotlib in Python?
Your currently selected backend, ‘agg’ does not support show(). AGG backend is for writing to file, not for rendering in a window. See the backend FAQ at the matplotlib web site. ImportError: No module named _backend_gdk For the second error, maybe your matplotlib distribution is not compiled with GTK support, or you miss the PyGTK … Read more
matplotlib: RuntimeError: Python is not installed as a framework
I run my script in virtualenv. Python version is 3.5. Add a line: in file: This solved the problem. If you want to know more about why adding this solves the problem, you can read about customizing matplotlib’s backend. And TkAgg solves this issue because of it’s dependency with Tkinter.
bbox_to_anchor and loc in matplotlib
When bbox_to_anchor and loc are used together, the loc argument will inform matplotlib which part of the bounding box of the legend should be placed at the arguments of bbox_to_anchor. For example (I’ve simplified the command a bit), the three options below will produce different locations for your legend, The first command will put the … Read more
matplotlib: how to draw a rectangle on image
You can add a Rectangle patch to the matplotlib Axes. For example (using the image from the tutorial here):
Scatter plot colorbar – Matplotlib
You’re passing in specific rgb values, so matplotlib can’t construct a colormap, because it doesn’t know how it relates to your original data. Instead of mapping the values to RGB colors, let scatter handle that for you. Instead of: Do: (Just pass in to c what you were originally passing into plt.cm.jet.) Then you’ll be … Read more
Plot correlation matrix using pandas
You can use pyplot.matshow() from matplotlib: Edit: In the comments was a request for how to change the axis tick labels. Here’s a deluxe version that is drawn on a bigger figure size, has axis labels to match the dataframe, and a colorbar legend to interpret the color scale. I’m including how to adjust the size and rotation … Read more
How to save a Seaborn plot into a file
I tried the following code (test_seaborn.py): But I get this error: I expect the final output.png will exist and look like this: How can I resolve the problem?
Linear regression with matplotlib / numpy
arange generates lists (well, numpy arrays); type help(np.arange) for the details. You don’t need to call it on existing lists. I should add that I tend to use poly1d here rather than write out “m*x+b” and the higher-order equivalents, so my version of your code would look something like this:
matplotlib does not show my drawings although I call pyplot.show()
If I set my backend to template in ~/.matplotlib/matplotlibrc, then I can reproduce your symptoms: ~/.matplotlib/matplotlibrc: Note that the file matplotlibrc may not be in directory ~/.matplotlib/. In this case, the following code shows where it is: If you edit ~/.matplotlib/matplotlibrc and change the backend to something like GtkAgg, you should see a plot. You … Read more