haskell,code-generation,arrows

Setting the bar We are entering a programming limbo competition to see how low we can go with arrows. Against the blare from the audience, the judges are asking for our starting bar height. Lofted by the fans, we select the crowd favorite low level virtual machine as our target...

Locate the container that these lists belong to and then go to template.css and add on the bottom, i.e.: .item ul li:before {display:none;} If you want to make it specific for a module, add a class to the module or use the module position ID and make it like: #fav-sidebar2...

import Control.Arrow import Control.Applicative h :: (Applicative f) => (a -> f b) -> (a -> f c) -> a -> f (b, c) h = liftA2 (liftA2 (,)) which is equal to h f g x = liftA2 (,) (f x) (g x)...

You can make a free arrow, which is like a tree, so you can inspect its structure. Or lower it to underlying arrow. One example is in the other SO question: Useful operations on free arrows

What the problem is When you use Haskell's arrow notation, it does not naively desugar proc v -> x -< y into the literal text arr (\v -> y) >>> x (using whatever arr and >>> are in-scope) but rather it uses the true values that it is expecting, desugaring...

python,matplotlib,colors,arrows

First you create a list of your colors colors and then you include the list into the forloop using itertools.izip. This here worked for me: import numpy as np from matplotlib import pyplot as plt from mpl_toolkits.mplot3d import Axes3D from matplotlib.patches import FancyArrowPatch from mpl_toolkits.mplot3d import proj3d import itertools class...

I think I got it, but I would be very interested if there is a simpler solution firstApp :: ArrowApply cat => cat t t1 -> cat (t, t2) (t1, t2) firstApp f = arr (\(x, y) -> (arr (\() -> (f, x))) >>> app >>> (arr (\v -> (v,...

On more of a broad picture, arrows get you out of Hask and into other categories there are to explore. The Kleisli category is probably the best-acquainted to Haskellers, followed by Cokleisli. Those are the natural "extensions" of Hask: add an endofunctor around either the result or argument, then you...

You've overspecialized. The definition of a functor is as follows: class Functor f where fmap :: (a -> b) -> f a -> f b The idea is that it takes a normal function and raises it into some context. But it's more than that: the idea is that it...

xml,haskell,arrows,hxt,monoids

It seems like you have some confusion between how the >>> and <+> operators work. To build intuition, let's first define two different bars: bar1 :: ArrowXml a => a XmlTree XmlTree bar1 = this <+> eelem "bar" bar2 :: ArrowXml a => a n XmlTree bar2 = eelem "bar"...

Your problem is that you're trying to do the recursion inside the function definition that you wrap with arr, and you call filterA f as though it were a function in this line: x : (filterA f xs) That only works if the arrow type is (->), which is what...

haskell,function-composition,arrows,category-theory

As Hackage and/or Hoogle will tell you, (>>>) :: Category k => a`k`b -> b`k`c -> a`k`c (<<<) :: Category k => b`k`c -> a`k`b -> a`k`c Observe that the latter is actually the same as (.) :: Category k => b`k`c -> a`k`b -> a`k`c or, in its Prelude...