I'm planning to do the following in `matlab`:

* Create an empty set
* Insert an element which specifies a certain criterion in it

So, as a quick run on the matlab command line I did the following:

```
>> e=78

e =

    78

>> Ck=[]

Ck =

     []

>> Cn=Ck+e

Cn =

     []

```

But, I was expecting to get the following:

```
Cn = [78]

```

Why didn't I get the expected result? And, how can I solve this out?

Thanks.