FACPACK: A software for the computation of multi-component factorisations and the area of feasible solutions. FACPACK is a software for the computation of nonnegative multi-component factorisations and for the numerical approximation of the area of feasible solutions (AFS). Effective tools for the reduction of the AFS by factor-locking and by the complementarity theory are included to FACPACK. The software comes with a graphical user interface (GUI) in MATLAB. FACPACK needs as input a mat-file which contains the spectral data matrix D whose rows are formed by a series of spectra. The software implements the polygon inflation algorithm which is explained in [7,8] and the generalized Borgen plots which are explained in

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