How to get a value in an array based on the sampled value

@aspen I took the liberty of editing the posts to format the code in monospace and no markdown formatting. You can format text as code inline with one backtick: The word `code` will be rendered in markdown as plain monospace text, like so: “The word code will be rendered in markdown as plain monospace text”.

For code block, you have to use three backticks, the following markdown for example:

Here is my example code:

```
import numpy as np
x = np.linspace(0, 1)
```

gets rendered as:

Here is my example code:

import numpy as np
x = np.linspace(0, 1)

Welcome to PyMC Discourse!