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対数軸のプロットの例
import numpy as np
import matplotlib.pyplot as plt
# Data for plotting
t = np.arange(0.01, 20.0, 0.01)
# Create figure
fig, ((ax1, ax2), (ax3, ax4)) = plt.subplots(2, 2)
# log y axis
ax1.semilogy(t, np.exp(-t / 5.0))
ax1.set(title='semilogy')
ax1.grid()
# log x axis
ax2.semilogx(t, np.sin(2 * np.pi * t))
ax2.set(title='semilogx')
ax2.grid()
# log x and y axis
ax3.loglog(t, 20 * np.exp(-t / 10.0), basex=2)
ax3.set(title='loglog base 2 on x')
ax3.grid()
# With errorbars: clip non-positive values
# Use new data for plotting
x = 10.0**np.linspace(0.0, 2.0, 20)
y = x**2.0
ax4.set_xscale("log", nonposx='clip')
ax4.set_yscale("log", nonposy='clip')
ax4.set(title='Errorbars go negative')
ax4.errorbar(x, y, xerr=0.1 * x, yerr=5.0 + 0.75 * y)
# ylim must be set after errorbar to allow errorbar to autoscale limits
ax4.set_ylim(bottom=0.1)
fig.tight_layout()
plt.show()
 
Python 3.11.2 見直しました。上記のコードでは、下記のエラーが発生します。
Traceback (most recent call last):
File "_:\Log_plots_01.py", line 21, in
ax3.loglog(t, 20 * np.exp(-t / 10.0), basex=2)
File "C:\Users\_____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\axes\_axes.py", line 1824, in loglog
self.set_xscale('log', **dx)
File "C:\Users\_____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\axes\_base.py", line 74, in wrapper
return get_method(self)(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\_____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\axis.py", line 810, in _set_axes_scale
ax._axis_map[name]._set_scale(value, **kwargs)
File "C:\Users\_____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\axis.py", line 767, in _set_scale
self._scale = mscale.scale_factory(value, self, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\_____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\scale.py", line 714, in scale_factory
return scale_cls(axis, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: LogScale.__init__() got an unexpected keyword argument 'basex'
import numpy as np
import matplotlib.pyplot as plt
# Data for plotting
t = np.arange(0.01, 20.0, 0.01)
# Create figure
fig, ((ax1, ax2), (ax3, ax4)) = plt.subplots(2, 2)
# log y axis
ax1.semilogy(t, np.exp(-t / 5.0))
ax1.set(title='semilogy')
ax1.grid()
# log x axis
ax2.semilogx(t, np.sin(2 * np.pi * t))
ax2.set(title='semilogx')
ax2.grid()
# log x and y axis
ax3.loglog(t, 20 * np.exp(-t / 10.0))
ax3.set_xscale('log', base=2)
ax3.set(title='loglog base 2 on x')
ax3.grid()
# With errorbars: clip non-positive values
# Use new data for plotting
x = 10.0**np.linspace(0.0, 2.0, 20)
y = x**2.0
ax4.set_xscale("log", nonpositive='clip')
ax4.set_yscale("log", nonpositive='clip')
ax4.set(title='Errorbars go negative')
ax4.errorbar(x, y, xerr=0.1 * x, yerr=5.0 + 0.75 * y)
# ylim must be set after errorbar to allow errorbar to autoscale limits
ax4.set_ylim(bottom=0.1)
fig.tight_layout()
plt.show()
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