[Python-Dev] calculator module (original) (raw)

thanos vassilakis latentthanos at mac.com
Wed Mar 10 21:21:11 EST 2004

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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