Matrix constructed from output of the Vech Command. In other words, restore the original symmetric matrix from its half-stacking vector.
Restores the symmetric matrix from the Vech command
VechM(vec)
vec |
A vector representing the half-stacking of a symmetric matrix |
This command re-construct a symmetric matrix from output of the Vech command
A symmetric matrix
Ruey S. Tsay
Tsay (2014, Appendix A)
Vech
v1=c(2,1,3) m1=VechM(v1) m1
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