mixexp (version 1.2.7)

crvtave: This function creates an extreme vertices design

Description

This function calls the function Vertcen which uses Piepel's (1988) fortran code (cnvrt) for generating extreme vertices and centroids of linearly constrained mixture experimental regions.

Usage

crvtave(ndm,conmx)

Arguments

ndm

is an integer representing the highest order of centroids requested. An overall centroid is always included, 0 indicates no other centroids will be created, 1 indicates edge centroids are requested, 2 indicates face centroids, etc.

conmx

This is the matrix of constraints.

Value

vtcn

This is a data frame containing the extreme vertices design. The columns are labeled x1, x2 ...xn, where n is the number of mixture variables. The last column is labeled dimen and it indicates the order of centroid where 0 is an extreme vertex, 1 is an edge centroid, 2 is a face centroid, and n is the overall centroid.

References

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

Examples

# NOT RUN {
data(conmx)
crvtave(1,conmx)

# }