When you use a subscript value that is negative or higher than the number of elements in an array, the resulting action depends on the programming language used.
Parallel arrays are two or more arrays in which each element of one array is concatenated with the same relative position element of the other array. An array index is out of range if it is not within the range of allowable indices.
Array indexing allows Mathcad to display the value of a particular element in an array. Used to refer to a single element in an array. Array indices are created with the [ key. This is called an index operator.
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