[Python-Dev] calculator module

[thanos vassilakis]

This has been an interesting thread....

I have an hp12c.py module written with my own python c extension of 
implementation of the Mike Cowlishaw (IEEE 754R + IEEE 854 + ANSI 
X3.274 +  ECMA 334) specs.
This  decimal.c module is in production on the floor of the a very 
large New York exchange. I have been kind of waiting for the dust to 
settle on  Facundo's work.  Then I would conform my module to what the 
python community finally decides. The module has been in production for 
over eight months, it has most of the  common Transcendentals and other 
interesting stuff, but only implements an emulation of decPacked.  My 
first version had the decimal ops as Context methods . Developers 
complained that it was not intuitive. So I was forced to create concept 
of named context scope, but I have never been happy with this.  It very 
fast

To demo and test the module I wrote a full emulation of the hp12c, TZYX 
stack and all. Most of the algorithms used for  IRR, Bond yield, dates 
etc, appeared in an article I wrote in the Algorithms Journal in 1987 
and we used Cyril Drimer, Mark Tsang  and I in the numerical package, 
Num++, we developed for Zortech's (later sold by Symantec ) C++ 
compiler. These algorithms are also documented on the back of the HP12c 
manual (beware of the errors in the equations !!)

Now how should I release it ? I will be having my first vacation for 
over 19 months in a few weeks, may be this will be a good time to clean 
it up and extend to meet the decimal number PEP.... any suggestions.

thanos










The question is how to release this in the public domain.
On Mar 10, 2004, at 6:17 PM, Greg Ewing wrote:

> Raymond Hettinger <raymond.hettinger at verizon.net>:
>
>> * cross-product and dot product for 3 element vectors (x,y,z
>> coordinates).
>
> Cross product would be good to have around somewhere in
> any case. It's frustrating that Numeric doesn't provide
> a straightforward way of getting it (not that I could
> see last time I looked, anyway).
>
> Greg Ewing, Computer Science Dept, 
> +--------------------------------------+
> University of Canterbury,	   | A citizen of NewZealandCorp, a	  |
> Christchurch, New Zealand	   | wholly-owned subsidiary of USA Inc.  |
> greg at cosc.canterbury.ac.nz	   +--------------------------------------+
>
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