Immutability Another tenet of functional programming philosophy is not to modify data outside the function. In practice, this means to avoid modifying the input arguments to a function.

The following is a simple mixed integer programming problem. Details can be found in Example 3.8 in the "Examples" section. data; input _row_ $10. choco gumdr ichoco igumdr _type_ $ _rhs_; datalines; ...

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Develop and fine-tune your programming skills the easy way--by example! For beginning and intermediate users, SAS Programming by Example guides you, with a series of annotated examples, through basic ...