How can be created a column vector by appending the columns/rows of an array?

## 1 Answer

**Matrix case**

You can turn a matrix in GAUSS into a column vector with either `vec` or `vecr`. The `vec` function will append each of the columns of a matrix in to one column vector, like this:

x = { 1 2 3, 4 5 6, 7 8 9 }; vec_1 = vec(x);

will set `vec_1` equal to:

1 4 7 2 5 8 3 6 9

`vecr` will create a vector by concatenating the rows of the input matrix and then transposing it into a column vector. For example:

x = { 1 2 3, 4 5 6, 7 8 9 }; vec_2 = vecr(x);

will set `vec_2` equal to:

1 2 3 4 5 6 7 8 9

**N-dimensional array case**

You can reshape a GAUSS N-dimensional array into a vector with the `vecr` function. For example:

dims = { 2, 3, 4 }; a = areshape(seqa(1, 1, 24), dims);

will create the 2x3x4 dimensional array with the following contents:

Plane [1,.,.] 1 2 3 4 5 6 7 8 9 10 11 12 Plane [2,.,.] 13 14 15 16 17 18 19 20 21 22 23 24

Continuing the example:

v = vecr(a);

will create the column vector, `v` equal to:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24