[Numpy-discussion] ANN: MaskedArray as a subclass of ndarray?-?followup

Francesc Altet faltet at carabos.com
Fri Jan 19 10:44:21 CST 2007


El dv 19 de 01 del 2007 a les 18:08 +0200, en/na Stefan van der Walt va
escriure:
> On Fri, Jan 19, 2007 at 02:13:52PM +0000, Matt Knox wrote:
> > > Moving the implementation to the C-level also has its downside.  To
> > > me, at least, Python code is much more readable and hence easier to
> > > maintain.
> > > 
> > > Is there a way that we can implement only the speed-critical methods
> > > in C?
> > > 
> > > Cheers
> > > Stéfan
> > > 
> > 
> > Implementing the whole thing in C also has the side benefit of the possibility
> > making a nice C level api available to these sub-classes. And I suspect the core
> > numpy developers are comfortable enough with C that maintainability is
> > *probably* not a huge concern here.
> 
> A "nice C level api" sounds like the definition of oxymoron :) Why
> would we argue for more C than absolutely necessary in a Python-based
> library?

I agree. In that sense, it would be nice to have a look at Pyrex and
implement the main classes with it. Its syntax is very similar to
Python, so doing this kind of translation should be pretty easy (at
least, much more than doing it in pure C). Pyrex has parts of its syntax
that are more C-flavored, and meant to reach high-performance (similar
to C code) in the parts of the code that really need it, or allows you
to link with pure C code easily.

Its only major disavantage from my point of view is that it doesn't have
support for easy indexing multi-dimensional arrays (you have to simulate
the indexes through unidimensional indexes, but this has never been a
problem for me) but if the amount of multidimensional job that you have
to do on your code is small (if any), then, it becomes a very poweful
tool for doing extensions IMO (you already should know that the random
sub-package in NumPy has been built using Pyrex).

My 2 cents,

-- 
Francesc Altet    |  Be careful about using the following code --
Carabos Coop. V.  |  I've only proven that it works, 
www.carabos.com   |  I haven't tested it. -- Donald Knuth



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