CODEWITHSUNDEEP
pythonmatplotlibfigure
Fredrik P
Fredrik P

Reputation: 694

Show entire minor gridline in matplotlib figure

I would like to show the topmost minor gridline (at 2.25) in its full width without adjusting the limits manually. How can I achieve this?

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

t = np.arange(0.0, 2.0, 0.01)
s = 1 + np.sin(2 * np.pi * t)

fig, ax = plt.subplots(constrained_layout=True)

ax.yaxis.set_tick_params(which='minor', width=5)
ax.plot(t, s)
ax.yaxis.set_major_locator(mpl.ticker.MultipleLocator(0.50))
ax.yaxis.set_minor_locator(mpl.ticker.MultipleLocator(0.25))
ax.grid(linewidth=5, axis='y', which='both')
ax.set_ylim(0, 2.25)

plt.show()

Screenshot

Upvotes: 0

Views: 296

Answers (1)

Coup
Coup

Reputation: 740

Adjusting edge gridline visibility in matplotlib

There are a couple ways to accomplish what you're looking for. I think the best method would be to hide the top and right spines. Alternatively, ax.grid takes Line2D args which includes clip_on. Setting clip_on=False has the intended effect of making the ax box not clip the line - but it does result in the top spine going through the grid line (which is not very attractive in my opinion). Lastly, as you mention, you could make a minor increase in y lim (to 2.26 or 2.27) and that would also make the top grid line more visible.

enter image description here

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

t = np.arange(0.0, 2.0, 0.01)
s = 1 + np.sin(2 * np.pi * t)

fig, axes = plt.subplots(nrows=2, ncols=2, figsize=(15,12))
axes = axes.flatten()

ax = axes[0]
ax.yaxis.set_tick_params(which='minor', width=5)
ax.plot(t, s)
ax.yaxis.set_major_locator(mpl.ticker.MultipleLocator(0.50))
ax.yaxis.set_minor_locator(mpl.ticker.MultipleLocator(0.25))
ax.grid(linewidth=5, axis='y', which='both', clip_on=False)
[ax.spines[s].set_visible(False) for s in ['top', 'right']]
ax.set_ylim(0, 2.25)
ax.set_title('Hide top/right spines', fontsize=16, fontweight='bold')

ax = axes[1]
ax.yaxis.set_tick_params(which='minor', width=5)
ax.plot(t, s)
ax.yaxis.set_major_locator(mpl.ticker.MultipleLocator(0.50))
ax.yaxis.set_minor_locator(mpl.ticker.MultipleLocator(0.25))
ax.grid(linewidth=5, axis='y', which='both', zorder=3, clip_on=False)
ax.set_ylim(0, 2.25)
ax.set_title('Make clip_on=False', fontsize=16, fontweight='bold')

ax  = axes[2]
ax.yaxis.set_tick_params(which='minor', width=5)
ax.plot(t, s)
ax.yaxis.set_major_locator(mpl.ticker.MultipleLocator(0.50))
ax.yaxis.set_minor_locator(mpl.ticker.MultipleLocator(0.25))
ax.grid(linewidth=5, axis='y', which='both')
ax.set_ylim(0, 2.265)
ax.set_title('Increase ylim to 2.265', fontsize=16, fontweight='bold')

axes[3].axis('off')

Upvotes: 2

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