On Fri, Aug 6, 2021 at 5:44 PM David Roe <roed.m...@gmail.com> wrote:
>
> I think Nils' original solution, of adding an immutable keyword option to the
> parent, is a good one. I've run into a similar issue with matrices, where I
> had to make them immutable before using them as dictionary keys.
> David
>
I agree with both of you. (My example above was just arguing not to
completely remove mutable vectors.)
> On Fri, Aug 6, 2021 at 7:39 PM Nils Bruin <nbr...@sfu.ca> wrote:
>>
>> On Friday, 6 August 2021 at 16:31:23 UTC-7 wst...@gmail.com wrote:
>>>
>>> To clarify, by "similar reasons to numpy", I meant that you open up
>>> the possibility of using Cython, vectorized operations, JITs like
>>> numba, etc. Some of these provide order of magnitude speedups and
>>> aren't an option with generic Python lists.
>>
>>
>> To clarify, this thread certainly didn't start out with the question if sage
>> should have mutable vectors at all (although I do think that in most cases,
>> an array would then work just as well). I think it is worth reconsidering
>> whether all vectors need to start out their life being mutable, because that
>> does come with a significant usability penalty in hash-related scenarios.
>>
>> It is indeed the case that we could just spell these examples as
>> {tuple(v+w): ... }, and probably that is what cached_function argument
>> manglers do, but .... to me that just looks super ugly (and the annoying
>> part is that it'll take me a error for every time I need to insert that).
>>
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William (http://wstein.org)
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