Haskell - Passing each element of array with another parameter to function

Question

I'm pretty new to Haskell, and have been trying to solve this for a while.

I have a function:

sumNodeError :: Node -> Layer -> Double
sumNodeError node childLayer = foldl (+) 0 (listProduct (weights node) (errors childLayer))

calculateNodeError :: Node -> Layer -> Double
calculateNodeError node childLayer = (sumNodeError node childLayer) * (value node) * (1.0 - (value node))

-- problem is in this function
calculateErrors :: Layer -> Layer -> Layer
calculateErrors layer childLayer = Layer (nodes layer)
                                         (map calculateNodeError (nodes layer) childLayer ) -- problem, need to map each of the nodes in the layer, and the childLayer to calculateNodeError
                                         (teacherSignals layer)
                                         (learningRate layer)

I am needing to pass each (nodes layer) and the childLayer to function calculateNodeError

The rest of the code (which isn't much) can be found here if you need: https://github.com/kennycason/haskell_nn/

Thanks a lot.

arrowd · Accepted Answer · 2013-06-04 18:36:43Z

5

Here you go

(map (\n -> calculateNodeError n childLayer) (nodes layer) )

answered Jun 4, 2013 at 18:36

arrowd

34.6k8 gold badges89 silver badges123 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Kenny Cason Over a year ago

Many thanks, that worked, I wasn't even aware that I could compose the function like that! :)

user2407038 · Accepted Answer · 2013-06-04 19:55:01Z

2

Here is another solution.

map ((flip calculateNodeError) childLayer) (nodes layer)

answered Jun 4, 2013 at 19:55

user2407038

14.7k3 gold badges31 silver badges45 bronze badges

Collectives™ on Stack Overflow

Haskell - Passing each element of array with another parameter to function

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related