Plot : Too many ticks on X axe

Question

The first loaded plot have too many ticks on X axe (see image01).

If I use the zoom action on X axe, the plot is now well loaded.

Can you give me some advise where I can search because The Plot constructor parameters seems good.

date_range = (735599.0, 735745.0)
x = (735610.5, 735647.0, 735647.5, 735648.5, 735669.0, 735699.0, 735701.5, 735702.5, 735709.5, 735725.5, 735728.5, 735735.5, 735736.0)
y = (227891.25361545716, 205090.4880046467, 208352.59317388065, 175462.99296699322, 98209.836461969651, 275063.37219361769, 219456.93600708069, 230731.12613806152, 209043.19805037521, 218297.51486296533, 208036.88967207001, 206311.71988471842, 216036.56824433553)
y0 = 218206.79192
x_after = (735610.5, 735647.0, 735647.5, 735701.5, 735702.5, 735709.5, 735725.5, 735728.5, 735735.5, 735736.0)
y_after = (227891.25361545716, 205090.4880046467, 208352.59317388065, 219456.93600708069, 230731.12613806152, 209043.19805037521, 218297.51486296533, 208036.88967207001, 206311.71988471842, 216036.56824433553)
linex = -39.1175584541
liney = 28993493.5251

ax.plot_date(x, numpy.array(y) / y0, color='r', xdate=True, marker='x')
ax.plot_date(x_after, numpy.array(y_after) / y0, color='r', xdate=True)
ax.set_xlim(date_range)
steps = list(ax.get_xlim())
steps.append(steps[-1] + 2)
steps = [steps[0] - 2] + steps
ax.plot(steps, numpy.array([linex * a + liney for a in steps]) / y0, color='b')

Thank you for your help. Manuel

Answer 1

If you have too many xtick labels, so many that they are all munged together on the plot, you can reduce them using pyplot.xticks. the arguments are the points the labels apply to, the labels themselves and an optional rotation.

import numpy as np
import matplotlib.pyplot as plt
y = np.arange(10000)
ticks = y - 5000
plt.plot(y)
k = 1000
ys = y[::k]
ys = np.append(ys, y[-1])
labels = ticks[::k]
labels = np.append(labels, ticks[-1])
plt.xticks(ys,labels, rotation='vertical')
plt.show()
plt.close()