Description Usage Arguments Details Value Author(s) Examples

Rotatable plot of support region for positive definite matrix with p=2

1 2 | ```
support.p2(theta = 110, phi = 10, lseq = 150, inc = 25, ticktype="detailed",
diagnose = FALSE, verbose = TRUE)
``` |

`theta` |
left-right plot rotation parameter in degrees |

`phi` |
up-down plot rotation parameter in degrees |

`lseq` |
number of cut points in v1 and in v2 |

`inc` |
increment in degrees of plot rotations |

`ticktype` |
simple or detailed ticks on variables |

`diagnose` |
Logical. T causes printing of diagnostic content |

`verbose` |
Logical. T causes printing of program ID before and after running |

Support region for p-variate positive definite matrix distributions is difficult to envision except for p=2. The diagonals of the matrix are V1 and V2 and the off-diagonal variable is V12. In our application 0<=V1,V2<=1, and -1<=V12<=1, so the bounded space is a hyper-rectangle. Each point in this region represents a symmetric pxp matrix, but not all of these are positive definite. This function shades the region of positive definite matrices.

Output is a plot that is rotatable via keyboard input. Upon exit, the latest values of the rotation parameters is listed to facilitate return to the latest plot

William R. Fairweather

1 2 3 4 | ```
## Not run: support.p2(theta = 110, phi = 10, lseq = 150, inc = 25,
ticktype = "detailed")
## End(Not run)
``` |

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