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12.5.9 Numeric Data Type Specific Index Functions

in_a_<type-name>

<type> in_a_<type-name>(index i, integer k, <type> d);

is the sum of d and the data in the k position in the i index (assumed of the <type> data type) or 0 if i does not map k. Data in the k position is set to the calculated sum.