Comments (11)
this and some related stuff will be in the next minor and major releases both
from vector.
GOOD IDEA.
I think we should totally get this into the 0.11 (we've a few other things we're keen on adding, and this totally makes sense to get into 0.11)
from vector.
It's actually difficult to be very efficient (I think). The problem is that the efficient way to build a vector is to write to a mutable vector and freeze. But when you are traversing, you have an arbitrary applicative involved blocking your ability to do efficient ST stuff. So, you can only build up ST actions as closures, or use an intermediate list/stream.
You can do better than creating a list first, of course. But it might always be a bit lackluster.
I think it's a good thing to have, though.
from vector.
I think it might look like this. Feel free to disregard the lens import, I was just using it for testing.
from vector.
It would also be very useful to have mapAccumL
, mapAccumR
, mapAccumLM
, mapAccumRM
, etc.
from vector.
Cant we define the stream / bundle version efficiently of traverse
efficiently though?
On Jan 23, 2015 4:27 AM, "yongqli" [email protected] wrote:
It would also be very useful to have mapAccumL, mapAccumR, mapAccumLM,
mapAccumRM, etc.—
Reply to this email directly or view it on GitHub
#69 (comment).
from vector.
Without contributing anything useful so far here, I'd benefit a lot from the mapAccum*
functions for vectors.
from vector.
Cant we define the stream / bundle version efficiently of traverse efficiently though?
Maybe. The trouble is that Stream and Bundle need an underlying monad, but traverse only gives us an applicative. But I think we can get away with a monad transformer that carries the applicative "along for the ride," as if it were some kind of monoidal functor.
from vector.
I am very interested in having some way of traversing vectors efficiently, especially in the way of the mapAccum*
functions. Is this possible at all?
from vector.
@dolio now that primMonad is stackable, can we do something for mutable vectors that partially addresses this?
from vector.
BUMP
from vector.
Related Issues (20)
- High level documentation? HOT 1
- overlaps for Data.Vector.Mutable behaves oddly for empty vectors HOT 2
- Performance issues with `foldl'` and large tuples HOT 3
- Add a variant unfoldrExactN, returning the resulting generator HOT 3
- Vector tests take more than 4GB memory to build HOT 3
- `Data.Vector.Fusion.Bundle.Size.Size` fields are not strict HOT 1
- Why is `Data.Vector.Generic.New.New` not a newtype? HOT 2
- Question: Is there a reason why `Unbox a => Maybe (Unbox a)` doesn't exist? HOT 1
- Is `vector` susceptible to the same fusion problems as `text`? HOT 2
- Improve compilation time HOT 3
- Split generic tests into separate package HOT 5
- Tests fail when built against QuickCheck-2.14.3 HOT 2
- New version vector 0.14? HOT 11
- Support `primitive-0.9` HOT 1
- Semantics and implementation of move for SoA vectors
- API using Applicative (traverse et.al.)
- Add total counterparts to partial functions, such as `head`. HOT 25
- catMaybes HOT 2
- Add strict boxed vectors HOT 12
- Data.Vector.Generic.New.unstream (and others) can't be specialized HOT 1
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from vector.