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# Drawing a horizontal line in Matplotlib

Programming
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Python
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Matplotlib
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Graphs Cookbook
schedule Mar 10, 2022
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local_offer PythonMatplotlib
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To draw a horizontal line in Matplotlib, use the `axhline(~)` function like so:

``` plt.axhline(y=0.5) ```

The output is as follows:

# Changing the color

To change color of the line, add the `color` parameter:

``` color="red" color="#FF0000" ```

# Changing the line style

To change the styling of the line, add the `linestyle` parameter:

``` linestyle="dotted"linestyle="dashed" ```

# Specifying the starting and endpoint points

By default, the line drawn by `axhline(~)` spans the entire width of the graph.

## xmin and xmax

You could change this behavior by specifying parameters `xmin` and `xmax`, both of which must be a number between 0 and 1.Here, 0 represents the left-side of your graph, while 1 represents the right-side of your graph.

To draw a horizontal line from left 25% to right 75%:

``` plt.xlim(0, 10)plt.axhline(y=2, xmin=0.25, xmax=0.75) ```

The output is as follows:

## x-coordinates

Unfortunately, the `axhline(~)` method does not accept starting and ending x-coordinates. We can instead resort to the `plt.plot(~)` function, which does allow for x-coordinates.

To draw a horizontal line from `x=2` to `x=8` at `y=5`:

``` plt.xlim(0, 10)plt.plot([2,8], [5,5]) ```

The output is as follows:

Published by Isshin Inada
Edited by 0 others
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