DIP80: phobos additions

[Ilya Yaroshenko via Digitalmars-d]

On Sunday, 14 June 2015 at 14:02:59 UTC, Ola Fosheim Grøstad 
wrote:
> On Sunday, 14 June 2015 at 13:48:23 UTC, Ilya Yaroshenko wrote:
>> Alignment, strides (windows on a stream - I understand it like 
>> Sliding Windows) are not a problem.
>
> It isn't a problem if you use the best possible abstraction 
> from the start. It is a problem if you don't focus on it from 
> the start.

I am sorry for this trolling:
Lisp is the best abstraction, thought.

Sometimes I find very cool abstract libraries, with relatively 
small number of users.
For example many programmers don't want to use Boost only because 
it's abstractions makes them crazy.

>> Convolutions, identiy matrices, invertible matrices are stuff 
>> I don't want to see in Phobos. They are about "MathD" not 
>> about (big) standard library.
>
> I don't see how you can get good performance without special 
> casing identity matrices, transposed matrices and so on. You 
> surely need to support matrix inversion, Gauss-Jordan 
> elimination (or the equivalent)  etc?

For daily scientific purposes - yes.
For R/Matlab like mathematical library - yes.
For real world application - no. Engineer can achieve best 
performance without special cases by lowering "abstraction" down. 
Simplicity and transparency ("how it works") is more important in 
this case.