Exteriorpts
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Purpose
Finds pts on the exterior of a data space after data are normalized.
Synopsis
- [loads,isel] = exteriorpts(x,ncomp,options)
Description
The data (X) are assumed to be all >0 and to be modelable as: X = CS' + E
Inputs
- x = MxN matrix.
- ncomp = number of components to extract.
Outputs
- loads = cell array with extracted pts/factors. Non-selectdim modes are determined via projection.
- isel = cell array with isel{options.selectdim} containing indices of selected pts.
Options
options = a structure array with the following fields:
- display : [ 'off' | {'on'} ] governs level of display to command window.
- samplemode : [ 1 ] mode that contains variance (factors for other modes are normalized to unit 2-norm).
- distmeasure : [ {'Euclidian'} | 'Mahalanobis' ]
- offset : [ 0.001 ] approximate noise level, points with 1-Norm <minnorm*max(norm(x)) are not used.
See Also
als, mcr, parafac, purity, purityengine