Figure 1
From: Peak picking NMR spectral data using non-negative matrix factorization
Illustration of the NTF2 model for peak picking a 3D NMR spectrum. The matrix Y is a 3D input NMR spectral data matrix. A q and X q are 2D matrices factorized from qth data plane of matrix Y representing the basis matrix and the source component matrix, respectively. N is the 3D matrix representing the residual error of the non-negative matrix factorization.