Add minor gridlines to matplotlib plot using seaborn

Question

I’m a fan of the Seaborn package for making nice-looking plots using Matplotlib. But I can’t seem to figure out how to show minor gridlines in my plots.

import numpy as np
import matplotlib.pyplot as plt
import seaborn as sbn

x = np.linspace(0, 2 * np.pi, 100)
y = np.sin(x)

fig, ax = plt.subplots(1, 1)
ax.scatter(x, y)

ax.grid(b=True, which='major')
ax.grid(b=True, which='minor')

gives:

enter image description here

Any thoughts here? Also any thoughts on how to adjust the style of the Seaborn gridlines that do show up…in particular, I’d love to make them narrower.

Asked By: 8one6

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Source

Answer 1

That’s because the minor ticks are not yet defined, so we need to add for example:

ax.set_xticks(np.arange(0,8)-0.5, minor=True)
ax.set_yticks([-1.25, -0.75, -0.25,0.24,0.75,1.25], minor=True)

enter image description here

Answered By: CT Zhu

Answer 2

Wound up combining CT Zhu’s answer with tcaswell’s hint:

import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt
import seaborn as sbn

x = np.linspace(0, 2 * np.pi, 100)
y = np.sin(x)

fig, ax = plt.subplots(1, 1)

ax.scatter(x, y)
ax.get_xaxis().set_minor_locator(mpl.ticker.AutoMinorLocator())
ax.get_yaxis().set_minor_locator(mpl.ticker.AutoMinorLocator())
ax.grid(b=True, which='major', color='w', linewidth=1.0)
ax.grid(b=True, which='minor', color='w', linewidth=0.5)

enter image description here

Answered By: 8one6

Add minor gridlines to matplotlib plot using seaborn

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