Description Usage Arguments Value References Examples

Generates a binary partitioning tree by recursively partitioning a dataset using a hierarchical collection of hyperplanes with high variance ratio custerability across them.

1 |

`X` |
a numeric matrix (num_data x num_dimensions); the dataset to be clustered. |

`K` |
the number of clusters to extract. |

`split.index` |
(optional) determines the order in which clusters are split (in decreasing order of split indices). can be a numeric valued function(v, X, P) of projection vector v, data matrix X and list of parameters P. can also be one of "size" (split the largest cluster), "fval" (split the cluster with the maximum variance ratio) or "Fdist" (split indices determined by the non-central F-distribution. See SSCI paper for details. slight difference from the paper is that when the data size is above 2000 cluster size is used instead. This is because the naive estimation of the model degrees of freedom has been found to be unreliable when the number of data is large). if omitted then "Fdist" is used. |

`v0` |
(optional) initial projection direction(s). a function(X) of the data being split, which returns a matrix with ncol(X) rows. each column of the output of v0(X) is used as an initialisation for projection pursuit. the solution with the maximum variance ratio is used within the final model. initialisations are determined separately for each cluster being split. if omitted then a single initialisation is used; the vector joining the cluster means of a 2-means solution. |

`minsize` |
(optional) the minimum cluster size allowable. if omitted then minsize = 1. |

`verb` |
(optional) verbosity level of optimisation procedure. verb==0 produces no output. verb==1 produces plots illustrating the progress of projection pursuit via plots of the projected data. verb==2 adds to these plots additional information about the progress. verb==3 creates a folder in working directory and stores all plots for verb==2. if omitted then verb==0. |

`labels` |
(optional) vector of class labels. not used in the actual clustering procedure. only used for illustrative purposes for values of verb>0. |

`maxit` |
(optional) maximum number of iterations in optimisation. if omitted then maxit=50. |

`ftol` |
(optional) tolerance level for convergence of optimisation, based on relative function value improvements. if omitted then ftol = 1e-8. |

a named list with class ppci_cluster_solution containing

`$cluster` |
cluster assignment vector. |

`$model` |
matrix containing the would-be location of each node (depth and position at depth) within a complete tree of appropriate depth. |

`$nodes` |
unnamed list each element of which is a named list containing details of the binary partitions at each node in the model. |

`$data` |
the data matrix being clustered. |

`$method` |
=="MCDC". used in plotting and model modification functions. |

`$args` |
named list of arguments passed to mcdc. |

Hofmeyr, D., Pavlidis, N. (2015) Maximum Clusterability Divisive Clustering. *Computational Intelligence, 2015 IEEE Symposium Series on*, pp. 780–786.

1 2 3 4 5 6 7 8 | ```
## load the dermatology dataset
data(dermatology)
## obtain a clustering solution using MCDC
sol <- mcdc(dermatology$x, 6)
## evaluate the performance of the solution using external cluster validity metrics
cluster_performance(sol$cluster, dermatology$c)
``` |

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