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Estimating Gene Function With LS-NMF 41Fig. 2. The PattRun interface after setting of the parameters for running LS-NMF.The arrows show the location of parameters to set before running the simulations.In order to get comparable decomposed matrices, amplitude (A) and pattern(P) matrices need to be normalized. The normalization chosen herein sets eachrow of P to unit amplitude (i.e., the sum of all elements of the row is 1). Thecolumns of A matrix must then be scaled inversely to leave M unchanged(see Eq. 1). There are many freely available tools that can be used to interpretthe results from LS-NMF simulation, herein ClutrFree is used (14), which isdescribed in Chapter 1 in this work. For mouse and human data, WebGestalt(15) is a useful web-based system that is described in Chapter 2 in this work.The graphical version of LS-NMF generates output files appropriate to use withClutrFree (see Note 7).3.4.1. Choosing a Single Best Simulation for AnalysisPattRun with LS-NMF will generate a series of results stored in directories(folders) in the directory containing the original data. Each directorywill contain one simulation result. The <strong>View</strong>er button on the PattRun windowcan be used to view these results one at a time. When it is pushed the first

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