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Anal Chem. 1992 Mar 15;64(6):599-607.

Generalized rank annihilation method using similarity transformations.

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Department of Chemistry, East Carolina University, Greenville, North Carolina 27858.

Erratum in

  • Anal Chem 1993 Jun 1;65(11):1647.


Recently several papers have described the generalized rank annihilation method; however, in some cases complex eigenvalues and eigenvectors may appear when the generalized eigenproblem is solved. When complex eigenvalues and eigenvectors are encountered, the results cannot be used to estimate pure component profiles (e.g. spectra or chromatograms). In this paper, a similarity transformation is used to transform complex eigenvalues and eigenvectors into real eigenvalues and eigenvectors, thereby permitting spectra and profiles of pure constituents to be estimated. The modified GRAM method is illustrated with simulated and real data.

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