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- function [c, x] = plspred(a, p, q, w, b, n)
- % PLSPRED Predicts concentrations in unknown spectra.
- % Copyright (c) 1989-92 by The MathWorks, Inc.
- %
- % PLSPRED predicts concentrations in unknown spectra using
- % desired number of factors from the calibration
- % generated by PLSF.M
- %
- % c = plspred(a, p, q, w, b, n) or [c, x] = plspred(a, p, q, w, b, n)
- %
- % Where:
- %
- % c is the matrix of the unknown's concentrations
- % x is the residual after decomposition of the unknown spectrum or spectra
- % a is the unknown spectrum (or spectra)
- % p is the matrix of spectral factors
- % q is the matrix of concentration factors
- % w is the matrix of weights
- % b is the vector containing the inner relationships
- % n is the number of factors to use
- %
- x = a';
- c = 0;
- [maxrank, h] = size(p);
- if n > maxrank, n = maxrank, end;
- for h=1:n
- t(:,h) = x * w(h,:)';
- x = x - t(:,h) * p(h,:);
- c = c + b(h) * t(:,h) * q(h,:);
- end
- c = c';
-