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Add warning if a variable name is repeated twice in match.on argument #34

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nielsenrich opened this issue Jun 3, 2020 · 0 comments
Open

Add warning if a variable name is repeated twice in match.on argument #34

nielsenrich opened this issue Jun 3, 2020 · 0 comments

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@nielsenrich
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Roozbeh included the same variable twice in a long list of matching variables and got this unhelpful error message:
Calculating Mahalanobis distances...
Error in solve.default(cov(dataset[, matchVars])) :
Lapack routine dgesv: system is exactly singular: U[18,18] = 0
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