Re: [julia-users] indexing over `zip(collection1, collection2)`

I've found it very useful, even if it is O(n) complexity to get the n-th element, to allow indexing. For a database, if you have a packed record (for example, like SQLite's row format), and you only need to access a single field, it's better to be able to do just that, and *not* have to unpack

Re: [julia-users] indexing over `zip(collection1, collection2)`

On Fri, 2016-06-24 at 05:26, Rafael Fourquet wrote: >> My recollection is that part of the indexing interface in Julia (just by >> convention) is that indexing should be of O(1) (or close to that) >> complexity. > > As the OP suggested, this could still be the case, the

Re: [julia-users] indexing over `zip(collection1, collection2)`

My recollection is that part of the indexing interface in Julia (just by convention) is that indexing should be of O(1) (or close to that) complexity. Iterable things, in general, have O(n) complexity to access the n-th element, because you have to traverse the data to get there (the classic

Re: [julia-users] indexing over `zip(collection1, collection2)`

Hi Jacob, In my view, in principle, all "iterators" should be indexable, (at least read-only), *unless *the underlying data is not indexable by nature, e.g. with data that comes from a stream... Doing `zip([1, 2], [2, 3])[1]` should probably just work. I also think that for `Zip`s if the

Re: [julia-users] indexing over `zip(collection1, collection2)`

Sorry, to clarify a little: The things you're zipping are not necessarily indexable (i.e. other iterators), so it's not safe to assume you can always index a Zip. On Thu, Jun 23, 2016 at 2:21 PM, Jacob Quinn wrote: > Most "iterator" types are not indexable, AFAIK. The

Re: [julia-users] indexing over `zip(collection1, collection2)`

Most "iterator" types are not indexable, AFAIK. The typical recommendation/idiom is to just call `collect(itr)` if you need to specifically index. -Jacob On Thu, Jun 23, 2016 at 2:18 PM, Davide Lasagna wrote: > Is there any particular reason why `Zip` objects are

[julia-users] indexing over `zip(collection1, collection2)`

Is there any particular reason why `Zip` objects are iterable but not indexable? Python allows that. >From previous discussion on the topic (2014 topic at https://groups.google.com/forum/#!topic/julia-dev/5bgMvzJveWA) it seems that it has not been implemented yet. Thanks,