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...e property that TX == 0. (One sticky bit is that you can't really just use proj() because T must have maximal rank. What is the current best practice for dealing with that? qr() pivoting?) summary.mlm print.summary.mlm vcov.mlm summary.mlm could be a little smarter than just coordinatewise summary.lm. It could at least provide the estimated residual covariance matrix (or SSD structure). vcov currently inherits from "lm" leading to a completely arbitrarily scaled matrix. The correct matrix is a Kronecker product of the unscaled covariance matrix and es...

atan(1i) -> 0 + Inf i complex(1/5) -> 0.2 + 0i atan(1i) -> (0 + Inf i) * (0.2 + 0i) -> 0*0.2 + 0*0i + Inf i * 0.2 + Inf i * 0i infinity times zero is undefined -> 0 + 0i + Inf i + NaN * i^2 -> 0 + 0i + Inf i - NaN -> NaN + Inf i I am not sure how complex arithmetic could arrive at another answer. I advise against messing with infinities... use atan2() if you don't