Description Usage Arguments Details Value See Also Examples

This function takes a symmetric matrix and extracts a list of all lower triangular elements.

1 | ```
vech(x)
``` |

`x` |
A symmetric matrix. |

This function checks to make sure the matrix is square, but it does not
check for symmetry (it just pulls the lower triangular elements). The
elements are stored in column major order. The original matrix can be
restored using the `xpnd`

command.

A list of the lower triangular elements.

1 2 |

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