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# Drawing a vertical line in Matplotlib

schedule Aug 12, 2023
Last updated
local_offer
PythonMatplotlib
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To draw a vertical line in Matplotlib, use the `axvline(~)` function like so:

``` plt.axvline(x=2) ```

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 starting and ending points

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

## ymin and ymax

You could change this behaviour by specifying parameters `ymin` and `ymax`, both of which must be a number between 0 and 1.Here, 0 represents the bottom of your graph, while 1 represents the top of your graph.

To draw a vertical line from bottom 25% to top 75%:

``` plt.ylim(0, 10)plt.axvline(x=2, ymin=0.25, ymax=0.75) ```

The output is as follows:

## y-coordinates

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

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

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

The output is as follows:

Published by Isshin Inada
Edited by 0 others
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