Extract project index value vector from a PP3 object.
PP3 object to get indices from.
Identification number of solution. Optional
number is missing then the whole projection index
vector is returned. If
number is specified then the
projection index associated with that identification number
Either a vector of indices, or a single index, depending on whether
number is not specified or it is, respectively.
G. P. Nason
Friedman, J.H. and Tukey, J.W. (1974) A projection pursuit algorithm for exploratory data analysis. IEEE Trans. Comput., 23, 881-890.
Jones, M.C. and Sibson, R. (1987) What is projection pursuit? (with discussion) J. R. Statist. Soc. A, 150, 1-36.
Nason, G. P. (1995) Three-dimensional projection pursuit. J. R. Statist. Soc. C, 44, 411-430.
Nason, G. P. (2001) Robust projection indices. J. R. Statist. Soc. B, 63, 551-567.
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# # See help for PP3many, this contains an example of using getPP3index. #
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