Description Usage Arguments Value Note Author(s) References

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

1 2 | ```
Eflags(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. |

`ifa ` |
This is the vector of error flags. A negative value for flag 1 indicates that there are inconsistent constraints. A negative value for flag2 indicates there are two many vertices and centroids, this program only works when # vertices + # centroids <=1000. A negative value for flag 3 indicates an error encountered when calling subroutine allnr. |

This function is called by the function crtave.

John S. Lawson [email protected]

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.

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.