# Plotting subspaces#

Summary

On this page, you will see how to

use the

`subspace`

key to select only certain parts of the parameter space for plottinguse

`col_wrap: auto`

when plotting`facet_grid`

panels to automatically square a plot with many columns and few rows.

For large parameter sweeps across many dimensions, you may often wish to only select a subspace of the whole parameter space for plotting.
This is easily achieved using the `subspace`

key. Subspace selection will also improve performance speeds, since less data is being loaded into memory.

Consider the facet grid example we considered in a previous section.
Here, we performed a parameter sweep across three dimensions (`seed`

, `transmission rate`

, `immunity rate`

) and plotted the resulting curves of the susceptible, infected, and recovered populations:

If we want to restrict ourselves to the subspace of `transmission rate = 0.2`

and `immunity rate < 0.3`

, we can do the following:

```
infection_curves_averaged:
# Same as before
based_on:
- .creator.multiverse
- .plot.facet_grid.errorbands
select_and_combine:
fields:
infected:
path: densities
transform:
- .sel: [!dag_prev , { kind: [infected] }]
# Add the following entry:
subspace:
transmission rate: [0.2]
immunity rate: [0, 0.1, 0.2]
transform:
- # same as before ...
x: time
y: infected density
yerr: yerr
col: immunity rate
hue: kind
```

Note that we are no longer assigning the `row`

key, as there is only a single row to plot!
The subspace selection led to a dimensionality reduction.

The output then looks like this:

Hint

Subspace selection happens via the `ParamSpace`

method `activate_subspace()`

, which also offers some other syntax options.

Hint

If you have lots of columns and few rows, use `col_wrap: auto`

to create a more square plot.