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Update guidance for unsigned integer data types for sum and prod #340

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Nov 29, 2021
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Update guidance for unsigned integer data types for sum and prod #340

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8 changes: 6 additions & 2 deletions spec/API_specification/statistical_functions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -134,7 +134,9 @@ For an input array `x`, let `N` equal the number of elements over which to compu
- data type of the returned array. If `None`,

- if the default data type corresponding to the data type "kind" (integer or floating-point) of `x` has a smaller range of values than the data type of `x` (e.g., `x` has data type `int64` and the default data type is `int32`, or `x` has data type `uint64` and the default data type is `int64`), the returned array must have the same data type as `x`.
- otherwise, the returned array must have the default data type corresponding to the data type "kind" (integer or floating-point) of `x`.
- if `x` has a floating-point data type, the returned array must have the default floating-point data type.
- if `x` has a signed integer data type (e.g., `int16`), the returned array must have the default integer data type.
- if `x` has an unsigned integer data type (e.g., `uint16`), the returned array must have an unsigned integer data type having the same number of bits as the default integer data type (e.g., if the default integer data type is `int32`, the returned array must have a `uint32` data type).

If the data type (either specified or resolved) differs from the data type of `x`, the input array should be cast to the specified data type before computing the product. Default: `None`.

Expand Down Expand Up @@ -217,7 +219,9 @@ For an input array `x`, let `N` equal the number of elements over which to compu
- data type of the returned array. If `None`,

- if the default data type corresponding to the data type "kind" (integer or floating-point) of `x` has a smaller range of values than the data type of `x` (e.g., `x` has data type `int64` and the default data type is `int32`, or `x` has data type `uint64` and the default data type is `int64`), the returned array must have the same data type as `x`.
- otherwise, the returned array must have the default data type corresponding to the data type "kind" (integer or floating-point) of `x`.
- if `x` has a floating-point data type, the returned array must have the default floating-point data type.
- if `x` has a signed integer data type (e.g., `int16`), the returned array must have the default integer data type.
- if `x` has an unsigned integer data type (e.g., `uint16`), the returned array must have an unsigned integer data type having the same number of bits as the default integer data type (e.g., if the default integer data type is `int32`, the returned array must have a `uint32` data type).

If the data type (either specified or resolved) differs from the data type of `x`, the input array should be cast to the specified data type before computing the sum. Default: `None`.

Expand Down