How can I plot a confusion matrix? [duplicate]
you can use plt.matshow() instead of plt.imshow() or you can use seaborn module’s heatmap (see documentation) to plot the confusion matrix
matplotlib
In Matplotlib, what does the argument mean in fig.add_subplot(111)?
These are subplot grid parameters encoded as a single integer. For example, “111” means “1×1 grid, first subplot” and “234” means “2×3 grid, 4th subplot”. Alternative form for add_subplot(111) is add_subplot(1, 1, 1).
Plot logarithmic axes with matplotlib in python
You can use the Axes.set_yscale method. That allows you to change the scale after the Axes object is created. That would also allow you to build a control to let the user pick the scale if you needed to. The relevant line to add is: You can use ‘linear’ to switch back to a linear scale. Here’s what your code would … Read more
How to plot a histogram using Matplotlib in Python with a list of data?
I am trying to plot a histogram using the matplotlib.hist() function but I am not sure how to do it. I have a list and a list of names(strings). How do I make the probability as my y-value of each bar and names as x-values?
No handles with labels found to put in legend
It might be late but for anyone with the same issue the solution is using the method legend() for the corresponding ax not as for plt
ImportError: ‘No module named plotly.plotly’ in LinuxMint17.3
You will need to install them first.
How to plot ROC curve in Python
I am trying to plot a ROC curve to evaluate the accuracy of a prediction model I developed in Python using logistic regression packages. I have computed the true positive rate as well as the false positive rate; however, I am unable to figure out how to plot these correctly using matplotlib and calculate the AUC value. … Read more
Save plot to image file instead of displaying it using Matplotlib
While the question has been answered, I’d like to add some useful tips when using matplotlib.pyplot.savefig. The file format can be specified by the extension: Will give a rasterized or vectorized output respectively, both which could be useful. In addition, there’s often an undesirable, whitespace around the image, which can be removed with: Note that … Read more
Plotting a 2D heatmap with Matplotlib
The imshow() function with parameters interpolation=’nearest’ and cmap=’hot’ should do what you want.
How do I draw a grid onto a plot in Python?
I just finished writing code to make a plot using pylab in Python and now I would like to superimpose a grid of 10×10 onto the scatter plot. How do I do that? My current code is the following: And its output is: What I would like is the following output: EDIT: Added an exemple, … Read more