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问题:
I want to get both horizontal and vertical grid lines on my plot but only the horizontal grid lines are appearing by default. I am using a pandas.DataFrame from an sql query in python to generate a line plot with dates on the x-axis. I'm not sure why they do not appear on the dates and I have tried to search for an answer to this but couldn't find one.
All I have used to plot the graph is the simple code below.
data.plot() grid('on')
data is the DataFrame which contains the dates and the data from the sql query.
I have also tried adding the code below but I still get the same output with no vertical grid lines.
ax = plt.axes() ax.yaxis.grid() # horizontal lines ax.xaxis.grid() # vertical lines
Any suggestions?
回答1:
You may need to give boolean arg in your calls, e.g. use ax.yaxis.grid(True) instead of ax.yaxis.grid(). Additionally, since you are using both of them you can combine into ax.grid, which works on both, rather than doing it once for each dimension.
ax = plt.gca() ax.grid(True)
That should sort you out.
回答2:
plt.gca().xaxis.grid(True) proved to be the solution for me
回答3:
maybe this can solve the problem: matplotlib, define size of a grid on a plot
ax.grid(True, which='both')
The truth is that the grid is working, but there's only one v-grid in 00:00 and no grid in others. I meet the same problem that there's only one grid in Nov 1 among many days.
回答4:
According to matplotlib documentation, The signature of the Axes class grid() method is as follows:
Axes.grid(b=None, which='major', axis='both', **kwargs)
Turn the axes grids on or off.
which can be ‘major’ (default), ‘minor’, or ‘both’ to control whether major tick grids, minor tick grids, or both are affected.
axis can be ‘both’ (default), ‘x’, or ‘y’ to control which set of gridlines are drawn.
So in order to show grid lines for both the x axis and y axis, we can use the the following code:
ax = plt.gca() ax.grid(which='major', axis='both', linestyle='--')
