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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.
The default method of ‘sequence()’ now allows to fully recycle all three of ‘(nvec, from, by)’ as always documented; with thanks to Mikael Jagan's report and patch in PR#18304. Its behaviour remains back compatible for now, but can be switched to future behaviour via environment variable ‘R_sequence_recycle’, or explicit ‘recycle = TRUE’.
The ‘implicitGeneric’ definition for ‘toeplitz()’ produced a default method that failed when ‘toeplitz(x, r)’ was called with more than the first argument. Simple fix from Mikael Jagan.