Plot the loadings of each variable on each principal component. Each variable is plotted as a colored line. In the future, I may expand this function to take prcomp and princomp objects, and to provide additional handles for manipulating the plots (e.g. number of variables and/or number of PCs to plot), outputting to pdf, etc.
a PCA rotation or loading matrix. Should have genes in rows and PCs in columns.
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