Description Usage Arguments Value

PCOPS version of elastic scaling with powers

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | ```
cop_powerelastic(
dis,
theta = c(1, 1, -2),
weightmat = 1 - diag(nrow(dis)),
init = NULL,
ndim = 2,
itmaxi = 10000,
...,
stressweight = 1,
cordweight = 0.5,
q = 1,
minpts = ndim + 1,
epsilon = 10,
rang = NULL,
verbose = 0,
scale = "sd",
normed = TRUE,
stresstype = c("default", "stress1", "rawstress", "normstress", "enormstress",
"enormstress1")
)
``` |

`dis` |
numeric matrix or dist object of a matrix of proximities |

`theta` |
the theta vector of powers; the first is kappa (for the fitted distances), the second lambda (for the observed proximities) and nu as the third (fixed to -2). If a scalar for the free parameters is given it is recycled. Defaults to 1 1 -2. |

`weightmat` |
(optional) a matrix of nonnegative weights |

`init` |
(optional) initial configuration |

`ndim` |
number of dimensions of the target space |

`itmaxi` |
number of iterations. default is 10000. |

`...` |
additional arguments to be passed to the fitting procedure |

`stressweight` |
weight to be used for the fit measure; defaults to 1 |

`cordweight` |
weight to be used for the cordillera; defaults to 0.5 |

`q` |
the norm of the cordillera; defaults to 1 |

`minpts` |
the minimum points to make up a cluster in OPTICS; defaults to ndim+1 |

`epsilon` |
the epsilon parameter of OPTICS, the neighbourhood that is checked; defaults to 10 |

`rang` |
range of the distances (min distance minus max distance). If NULL (default) the cordillera will be normed to each configuration's maximum distance, so an absolute value of goodness-of-clusteredness. |

`verbose` |
numeric value hat prints information on the fitting process; >2 is extremely verbose |

`scale` |
should the configuration be scale adjusted |

`normed` |
should the cordillera be normed; defaults to TRUE |

`stresstype` |
which stress to report? Defaults to explicitly normed stress |

A list with the components

stress: the stress

stress.m: default normalized stress

copstress: the weighted loss value

OC: the Optics cordillera value

parameters: the parameters used for fitting (kappa, lambda)

fit: the returned object of the fitting procedure

cordillera: the cordillera object

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