Vertcen function

Loads compiled fortran in shared file cnvrt

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

Vertcen(ndm,nvrr,ncon2,rtheta2)

Arguments

• 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.

Returns

• rxvt: This is the matrix of vertices and centroids stored as a vector of columns.

References

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.

Note

This function is called by the function crtave.

Author(s)

John S. Lawson lawson@byu.edu