# Define the size of a grid on a plot using Matplotlib

### Question

I am plotting using Matplotlib in Python. I want create plot with grid, and here is an example from a plotting tutorial. In my plot range if the y axis is from 0 to 14 and if I use `pylab.grid(True)` then it makes a grid with the size of square of two, but I want the size to be 1. How can I force it?

1
22
1/8/2018 11:20:51 PM

Try using `ax.grid(True, which='both')` to position your grid lines on both major and minor ticks, as suggested here.

EDIT: Or just set your ticks manually, like this:

``````import matplotlib.pyplot as plt

fig = plt.figure()
ax.plot([1,2,3,14],'ro-')

ax.xaxis.set_ticks([1.,2.,3.,10.])
ax.grid(True)

plt.show()
``````
24
5/4/2012 6:17:32 PM

If you want to follow along with the example you cited:

``````>>> import numpy
>>> import pylab
>>> t = numpy.arange(0.0, 1.0+0.1, 0.01)
>>> s = numpy.cos(2*2*numpy.pi*t)
>>> pylab.plot(t,s)
>>> pylab.grid(True)
>>> pylab.xticks([i/10.0 for i in range(0,12)])
>>> pylab.show()
``````