PLS_Toolbox Documentation: unfoldm	< tucker	unfoldmw >

unfoldm

Purpose

Unfolds an augmented matrix for MPCA.

Synopsis

xmpca = unfoldm(xaug,nsamp)

Description

UNFOLDM unfolds the input matrix xaug to create a matrix of unfolded row vectors xmpca for MPCA. xaug contains nsamp matrices A_j augmented such that [xaug] = [A₁; A₂; ...; A_nsamp]. For example, for xaug of size (nsamp*m by n) each matrix A_j is of size m by n. For A_j each m by 1 column a_i is transposed and augmented such that [b_j] = [a₁', a₂', ..., a_n'] and [xmpca] = [b₁; b₂; ...; b_nsamp]. Note: the A_j should all be the same size.

Examples

a = [1     2     3

     4     5     6

    -1    -2    -3

    -4    -5    -6]

xmpca = unfoldm(a,2)

xmpca = [1     4     2     5     3     6

        -1    -4    -2    -5    -3    -6]

See Also

gscale, mpca, npls, parafac, parafac2, pca, reshape, tucker, unfoldmw