logarithmic

major gridlines with LogLocator behave incorrectly? Question: I am trying to mark the major gridlines of a semilogx plot with thicker lines. However, the code below (SSCCE) only highlights every second gridline. import matplotlib.pyplot as plt from matplotlib.ticker import (MultipleLocator, LogLocator) # configuration xValues = [0.1, 1, 10, 100, 1e3, 10e3, 100e3, 1e6, 10e6, 100e6] …