**Matplotlib**

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**Graphs Cookbook**

# Drawing a vertical line in Matplotlib

*schedule*May 20, 2023

*toc*Table of Contents

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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: