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- function [p] = pmatrix(a, c)
- % PMATRIX Calculate the P-matrix calibration coefficients.
- %
- % Copyright (c) 1989-92 by The MathWorks, Inc.
- %
- % PMATRIX calculates the P-matrix calibration coefficients
- % for a given set of calibration mixtures.
- %
- % p = pmatrix(a, c)
- %
- % Where:
- %
- % p is the calibration matrix
- % a is the absorbance matrix
- % c is the concentration matrix
- %
- % The concentrations of components in unknown spectra can be calculated
- % if the unknown absorbances are set up as a vector (for 1
- % unknown) or a matrix (for multiple unknowns). The unknown matrix
- % can have any available name. For example call it "u". The
- % unknown concentrations are then given by p * u.
- %
- % For more details, refer to pages 141 and 142 of the ASTM
- % publication "Computerized Quantitative Infrared Analysis".
- %
- p = c * a' * inv(a * a');
-