matplotlib & seaborn tricks

Moved to: Plotting - wiki, this post is no longer updated.

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Recently I have been using these package, and found some little tricks. I'll have to write them down just to save the future me.

Last updated: 20200524-1500 CEST

General

Any colormap can be reversed by adding _r after its name, e.g. cmap="RdBu_r" makes the smaller value blue and the bigger value red.

Single plot

Title

Seaborn: sns.someplot(…).set_title("This is a title")

Axis

Use plt.axis('equal') before any two-way plot to set the x-axis and y-axis the same scale.

Set label: fig.xlabel(r"Value of $x$")

Plot with subplots

Sizing

Put this right before plt.show() or fig.savefig() (credit): fig.tight_layout()

Title

Main title (credit): plt.subplots_adjust(top=0.9); grid.fig.suptitle("This is a big title")

Sub titles: ax[0, 0].set_title('Axis [0, 0]')

Axis

Use graph.axes.Axes.set_xlim(left=0) to set only lower limit, and the upper limit would be auto-generated.

Set label: ax[0,0].set_xlabel(r"Value of $x_1$")