matplotlib force scientific notation and define exponent
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.ticker
class OOMFormatter(matplotlib.ticker.ScalarFormatter):
def __init__(self, order=0, fformat="%1.1f", offset=True, mathText=True):
self.oom = order
self.fformat = fformat
matplotlib.ticker.ScalarFormatter.__init__(self,useOffset=offset,useMathText=mathText)
def _set_order_of_magnitude(self):
self.orderOfMagnitude = self.oom
def _set_format(self, vmin=None, vmax=None):
self.format = self.fformat
if self._useMathText:
self.format = r'$\mathdefault{%s}$' % self.format
x = np.linspace(1,9,9)
y1 = x*10**(-4)
y2 = x*10**(-3)
fig, ax = plt.subplots(2,1,sharex=True)
ax[0].plot(x,y1)
ax[1].plot(x,y2)
for axe in ax:
axe.yaxis.set_major_formatter(OOMFormatter(-4, "%1.1f"))
axe.ticklabel_format(axis='y', style='sci', scilimits=(-4,-4))
plt.show()