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# Plotting two lines with different y axis in Matplotlib

schedule Aug 11, 2023
Last updated
local_offer
PythonMatplotlib
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We can plot two lines with different y axis in Matplotlib using the `twinx()` method.

# Example

To plot two sets of y values `y1` and `y2` on the same x-axis:

``` import matplotlib.pyplot as pltfig, ax = plt.subplots()x = [1,2,3]y1 = [1,2,3]y2 = [110,110,110]ax.plot(x, y1, color="blue") # set line color to blueax.set_xlabel('X Axis')ax.set_ylabel('Y1 Axis', color="blue") # set y axis title to blueax.tick_params(axis='y', colors="blue") # set y axis tick labels to blue# We create another axis object. It shares the same x axis as ax, but the y-axis is separate.ax2 = ax.twinx()ax2.plot(x, y2, color="red") # set line color to redax2.set_ylabel('Y2 Axis', color="red") # set y axis title to redax2.tick_params(axis='y', colors="red") # set y axis tick labels to redplt.show() ```

The output is as follows:

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