vech {OpenMx} | R Documentation |

## Half-vectorization

### Description

This function returns the half-vectorization of an input matrix as a column vector.

### Usage

```
vech(x)
```

### Arguments

### Details

The half-vectorization of an input matrix consists of the elements in the lower triangle of the matrix, including the elements along the diagonal of the matrix, as a column vector. The column vector is created by traversing the matrix in column-major order.

### See Also

`vech2full`

, `vechs`

, `rvectorize`

, `cvectorize`

### Examples

```
vech(matrix(1:9, 3, 3))
vech(matrix(1:12, 3, 4))
```

[Package

*OpenMx* version 2.21.11

Index]