1 | initial version |

The reason is the following: the notebook and command line interface, when they are evaluating input, at the end they always output the value of the last line in the input, if it is not `None`

.

So indeed, if you enter `matrix_plot(5*A)`

directly, you get your plot because it is the value of that line.

When you enter `f(5)`

, the body of the function is executed as it should be, but this function body does not explicitly `return`

any value, so the default value `None`

is returned, which results in no output.

You probably meant to write:

```
def f(n):
return matrix_plot(n*A)
```

or equivalently

```
f = lambda n: matrix_plot(n*A)
```

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