So I have a csv in the form 

```
1,2,3,4,5 

6,7,8,9,10

```

and so on. 

However what I want to be able to do is append a string character at the end of each record like

```
1,2,3,4,5,A 

6,7,8,9,10, B 

```

and so on. 

Is there anyway to do this efficiently in matlab/octave?