José Fonseca wrote:
to say that the manipulation of numeric arrays is only of interest to scientific programmers is the same of when in the early computing days engineers saing that computers would only be good for crunching numbers, and that the concept of personal computers was just non-sense...
I absolutely concur.
For a non-scientic usage of Numeric see the examples in http://www.pygame.org/pcr/repository.php, but I can imagine the usefullness of Numeric in many more non-scientific applications: imaging, sound visualization plugins, 3D graphics, and probably much more.
It goes MUCH farther than this. All these examples are what I would call serious number crunching. Perhaps not strictly scientific, but certainly the realm of numeric programming, and all places where the "kinds" concept would be useful.
However, there is a great deal of usefulness in Numeric for applications that are not doing a lot of number crunching. Performance is only one reason to use Numeric. The other reason is much cleaner and easier syntax for manipulating arrays of numbers, especially ones of more than one dimension. Being able to slice across multiple dimensions, array oriented arithmetic, overloaded comparisons, etc. I use Numeric for virtually every program I write, whether performance is an issue or not. Not having to write all those ugly, confusing and error prone loops is a godsend.
All that being said, the "kinds" concept is probably mostly of concern to the Number crunching community. However, it is also sort of a low level concept, and having it part of core language makes sense, just like it makes sense to have complex number and long integers in the core language.
-Chris