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JMP 12 Scripting Guide by SAS Institute

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Chapter 7 
Data Structures
Working with Collections of Data
JSL provides these basic data structures that can hold a variety of data in a single variable:
A list holds a number of other values, including nested lists and expressions.
A matrix is a row-by-column table of numbers.
An associative array maps keys to values, which can be almost any other type of data.

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