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### M1.6. More Matrix Stuff

A matrix can be constructed from two or more vectors. If we wish to create a matrix v which consists of two columns, the first column containing the vector x (in column form) and the second column containing the vector z (in column form), we can use the following (where x and z are previously generated row vectors):

```» v = [x',z']
v =
1     5
3    10
5    15
7    20
9    25
11    30
```

If we wished to look at the first column of v, we could use (where : indicates all rows, while the 1 indicates the first column)

```» v(:,1)
ans =
1
3
5
7
9
11
```

If we wished to look at the second column of v, we could use

```» v(:,2)
ans =
5
10
15
20
25
30
```

And we can construct the same plot as before by using the following plot command ('--' gives a dashed line): ...

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