This function loads and runs the compiled fortran code cnvrt. cnvrt is Piepel's 1988 JQT fortran code for extreme vertices designs.

1 2 | ```
Vertcen(ndm,nvrr,ncon2,rtheta2)
``` |

`ndm` |
This is the order of centroids desired (0=none, 1=edge centroids, 2=face centroids etc.) |

`nvrr` |
This is the number of mixture variables ( maximum is 12) |

`ncon2` |
This is the number of constraints (maximum is 45) |

`rtheta2` |
This is the constraint matrix stored as a vector of columns. |

`rxvt ` |
This is the matrix of vertices and centroids stored as a vector of columns. |

This function is called by the function crtave.

John S. Lawson lawson@byu.edu

1. Piepel, G. F. "Programs for Generating Extreme Vertices and Centroids of Linearly Consrtained Experimental Regions"
*Journal of Quality Technology*, Vol 20, No. 2, pp. 125-139, 1988.

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