https://bugzilla.wikimedia.org/show_bug.cgi?id=56682
Web browser: ---
Bug ID: 56682
Summary: Avoid floating point errors when manipulating decimal
values
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: WikidataRepo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Mobile Platform: ---
Floating point errors should be avoided when handling/manipulating QueryValue
and DecimalValue objects. One situation where such errors frequently show is
when adding an uncertainty margin to a base amount to comput the upper and
lower bounds of a quantity.
The errors are introduced because DecimalMath, a class that implements basic
arithmetical operation on DecimalValue objects, uses float numbers to perform
the calculations.
To avoid this, we could use the bcmath library, if it is installed.
Also, smart rounding rules could be employed to reduce the ill effects of
floating point errors.
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