r-cran-misctools 0.6-26-1 (s390x binary) in ubuntu focal

 Many of them facilitate the work with matrices, e.g. inserting rows or
 columns, creating symmetric matrices, or checking for semidefiniteness. Other
 tools facilitate the work with regression models, e.g. extracting the standard
 errors, obtaining the number of (estimated) parameters, or calculating
 R-squared values.