### Numbers and the like

- From:
- Paolo Redaelli
- Date:
- 2011-09-23 @ 12:34

I was starting to wrap Eigen library the king of the hill in linear
algebra (http://eigen.tuxfamily.org/index.php?title=Main_Page yes,
better than atlas and most of the times on par with Intel proprietary
library) discovering that we are a little weak on numeric side:
* COMPLEX is still missing
* rational numbers are now "buried" under
FRACTION_WITH_BIG_INTEGER_NUMBER, we may want to give it a status
almost on par with integers;
* the semantic of NUMBER is not what most people would expect, i.e.
I would turn it into an expanded type, holding a reference to its
actual content, more or less like Ginac (http://www.ginac.de/)
does with its Ex type.
* people working for banks needs DECIMAL_[32|64|128] and fixed-point
arithmetic; see
http://en.wikipedia.org/wiki/Decimal32_floating-point_format
http://en.wikipedia.org/wiki/Fixed-point_arithmetic. Perhaps
wrapping http://en.wikipedia.org/wiki/Libfixmath may be a possibility.