The DO Loop

Statistical programming in SAS with an emphasis on SAS/IML programs
Learn SAS
Rick Wicklin 4
How the J function got its name

In linear algebra, the I symbol is used to denote an n x n identity matrix. The symbol J (or sometimes 1) is used to denote an n x p matrix of ones. When the SAS/IML language was implemented, the I function was defined to generate the identity matrix. The J function was defined

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