Description Usage Arguments Note Author(s) References Examples

This function calls the function crvtave to create an extreme vertices design in a constrained mixture space. If there are only three factors the function DesignPoints is called to plot the results.

1 2 3 4 |

`nfac` |
an integer representing the number of mixture variables in the design. Maximum nfac=12 |

`uc` |
a vector of length nfac containing upper constraints on each mixture component |

`lc` |
a vector of length nfac containing lower constraints on each mixture component |

`nlc` |
the number of linear constraints, the default is zero |

`lb` |
a vector of length nlc containing the lower bounds for the linear constraints |

`ub` |
a vector of length nlc containing the upper bounds for the linear constraints |

`coef` |
an nlc by nfac matrix containing the coefficients of the components of the linear constraints |

`ndm` |
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, etc. |

`plot` |
a logical variable indicating whether a plot of the design is desired when there are only 3 components. Default is TRUE |

`cornerlabs` |
This is a vector of text labels for the x1, x2 and x3 vertices. Use when there are only 3 components for plotting. |

`axislabs` |
This is a vector of text labels for the x1, x2 and x3 axis. Use when there are only 3 components for plotting. |

`pseudo` |
logical variable, when TRUE plot in pseudo component space when there are lower constraints. |

This function calls crvtave. If the number of factors is 3, the function DesignPoints is called to graph the results.

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.

2. "John Lawson, Cameron Willden (2016).", "Mixture Experiments in R Using mixexp.", "Journal of Statistical Software, Code Snippets, 72(2), 1-20.", "doi:10.18637/jss.v072.c02"

1 2 3 4 5 6 7 8 9 10 11 12 13 | ```
# Polvoron Example from Lawson
des<-Xvert(3,uc=c(.8,.95,.50),lc=c(0,.10,.05),ndm=1,plot=FALSE)
#Snee Marquardt(1976) example
Xvert(8,uc=c(.45,.50,.10,.4,.6,.2,.05,.05),lc=c(.1,.05,0,0,.1,.05,0,0),ndm=0)
# Example page 465
exvert<-Xvert(4,uc=c(.188,.128,.438,.438),lc=c(.124,.064,.374,.374),ndm=2)
# Example from Piepel 1988
coef<-matrix(c(.85,.9,1,.7,0,1),ncol=3,byrow=TRUE)
des<-Xvert(3,lc=c(.1,.1,0),uc=c(.5,.7,.7),nlc=2,lb=c(.9,.4),ub=c(.95,0),coef,ndm=1,plot=FALSE)
``` |

mixexp documentation built on May 29, 2017, 7:09 p.m.

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.