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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-429) Arithmetic operation on quantities on values converted to system units
Date Sun, 29 Jul 2018 15:58:00 GMT
Martin Desruisseaux created SIS-429:
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             Summary: Arithmetic operation on quantities on values converted to system units
                 Key: SIS-429
                 URL: https://issues.apache.org/jira/browse/SIS-429
             Project: Spatial Information Systems
          Issue Type: Improvement
            Reporter: Martin Desruisseaux


The result of arithmetic operations on quantities shall be as if all values were converted
to system quantities before the operations is performed. For most units, it make no difference.
But for temperature in Celsius, it as more complex consequences (1°C + 2°C = 276.15 °C).
While the above seems counter-intuitive, it is essential for preserving arithmetic laws like
associativity and commutativity.

The more intuitive result (1°C + 2°C = 3°C) requires than one of the operand is treated
as a _temperature increment_ instead than a _temperature measurement_. Such distinction is
out of scope of the issue, since it would require a change in Unit API.



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