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42 Wang and OchsFig. 3. The PattRun-viewer interface with the pattern shown. The viewer allows theuser to look at the data, the reconstructed data (mock), the residuals, the patterns, andthe distributions. In addition, using the basis vector button allows users to look forgenes strongly tied to one or more patterns.time, it will load the most recent simulation for visualization. Different filescan be visualized by pressing the Load button.1. Load each simulation in turn, and record the χ 2 value at the top of viewer window.NMF algorithms will move to the local minimum in χ 2 , so generally it will notfind an optimal solution.2. Reload the simulation with the best χ 2 value. This will be the simulation to usefor further analysis. One can look at each pattern (behavior across condition,herein time-course) and decide if a pattern is of interest. To do this, mark thePattern checkbox and press the Graph button. Use the < and > buttons to movebetween patterns. An example is shown in Fig. 3.3. The best simulation can be output to a tab-delimited file by pressing the Exportbutton. Provide a name for the output file in the Save dialog. Mark the Pattern andDistribution, check boxes, and then press the Save button. The output file can beedited with a spreadsheet program, the patterns can be plotted, and in Subheading3.4.3. this information can be used for interpretation.3.4.2. Interpreting the Simulation Results With ClutrFreeClutrFree is a visualization tool for analyzing gene enrichment, GO annotation,and other aspects involved in gene expression and phylogenomic studies.

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