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Jim Simon 0
Time to trade in your jalopy macro?

Suppose you have an old jalopy that's perfectly reliable.  Your jalopy gets you where you wanna go: no frills; no drama. Do you trade your old wheels in for a racecar that accelerates like crazy and corners like it's on rails? Or stick with what's old and comfortable?   Your choice

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Rick Wicklin 0
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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