ar­ray – Ex­tend­ing the ar­ray and tab­u­lar en­vi­ron­ments

An ex­tended im­ple­men­ta­tion of the ar­ray and tab­u­lar en­vi­ron­ments which ex­tends the op­tions for col­umn for­mats, and pro­vides "pro­grammable" for­mat spec­i­fi­ca­tions.
This pack­age is part of the tools bun­dle in the LaTeX re­quired dis­tri­bu­tion.