ols inv when zero regressors#74

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iancharest wants to merge 5 commits intomasterfrom

Commits on Jan 20, 2021

initial commit for the handling of columns with all zeros in design matrices.
Ian Charest
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now handling designs with zero regressors
Ian Charest
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fixes #47, tests pass
Ian Charest
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fix for plotting in example.py
Ian Charest
committed
some bug tweaks, and figure reporting updated
Ian Charest
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