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A general description is here.
‘chol(x, pivot=TRUE)’ now zeroes the trailing submatrix when the algorithm stops early. Following the help page instructions on how to reconstruct the matrix in positive semidefinite cases gave incorrect results if the rank was 2 or more less than the dimension (PR#15853).
‘pairwise.t.test()’ misbehaved when subgroups had 0 DF for variance, even with ‘pool.sd = TRUE’. (PR#18594 by Jack Berry.)
‘identical(attrib.as.set=FALSE)’ now works correctly with data frames with default row names. (Thanks to Charlie Gao's PR#18179.)
