The DO Loop

Statistical programming in SAS with an emphasis on SAS/IML programs
Programming Tips
Rick Wicklin 0
Trap and map: Trapping invalid values

Finite-precision computations can be tricky. You might know, mathematically, that a certain result must be non-negative or must be within a certain interval. However, when you actually compute that result on a computer that uses finite-precision, you might observe that the value is slightly negative or slightly outside of the

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