Description Usage Arguments See Also Examples

Fills a matrix from a vector that represents the lower triangle. If user does not supply a value for diag, then the vech will fill in the diagonal as well as the strictly lower triangle. If diag is provided (either a number or a vector), then vech is for the strictly lower triangular part. The default value for lowerOnly is FALSE, which means that a symmetric matrix will be created. See examples for a demonstration of how to fill in the lower triangle and leave the diagonal and the upper triangle empty.

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`vech` |
A vector |

`diag` |
Optional. A single value or a vector for the diagonal. A vech is a strictly lower triangluar vech, it does not include diagonal values. diag can be either a single value (to replace all elements along the diagonal) or a vector of the correct length to replace the diagonal. |

`lowerOnly` |
Default = FALSE. |

Similar functions exist in many packages, see
`vec2sm`

in corpcor, `xpnd`

in MCMCpack

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