XploRe Help : transform

Keywords - Function groups - @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Library:	graphic
See also:	groupcol

Quantlet:		transform
Description:		Transforms the given dataset.

Usage:	`y = transform (x, prep)`
Input:
	`x`	n x p matrix
	`prep`	scalar
Output:
	`y`	n x p matrix

Note:

prep allows some transformation of the data: grc.prep.none 0 no transformation grc.prep.standard 1 standardize grc.prep.zeroone 2 to [0,1] grc.prep.pcacov 3 pca on cov matrix grc.prep.pcacorr 4 pca on corr matrix grc.prep.sphere 5 sphering

Example:

; loads the library graphic library("graphic") ; generates a matrix(100x5) with uniform random numbers x = uniform(100, 5) ; computes the principal components of x y = transform(x, grc.prep.pcacov) y

Result:

returns the principal components of x based on the
covariance matrix

Author: S. Klinke, 19970201