Re: Python slices in Scheme

[Damien Mattei <damien.mattei@gmail.com>]

it seems a big work ,
thanks

On Mon, Jun 19, 2023 at 6:37 PM lloda <lloda@sarc.name> wrote:

>
> My library guile-newra (1) has quite general multidimensional array
> slicing. The indices can be linear ranges or arbitrary integer arrays and
> they can have any rank. You can also use the indexed array as write target.
> If all the indices are linear ranges then the operation is done without
> copies. It also has placeholders, so you can skip axes, like :  and ... in
> numpy. guile-newra's arrays are applicative, so you can do (thearray
> firstindex secondindex ...), without special brackets.
>
> You need wrappers to use it with Guile's native array types, so it may not
> be as convenient. Or maybe you don't need to handle arbitrary rank, then it
> might not be the best option. It's also far from finished, although the
> stuff I mentioned above does work.
>
> I didn't adopt Pythons -1 = end convention because in Guile arrays can
> have any base index, not necessarily 0 (whether that's a good idea or not).
>
> (1) https://lloda.github.io/guile-newra/#Slicing <
> https://lloda.github.io/guile-newra/#Slicing>
> https://github.com/lloda/guile-newra/ <
> https://github.com/lloda/guile-newra/>
> https://notabug.org/lloda/guile-newra <
> https://notabug.org/lloda/guile-newra>
>
>