Wouldn't it do just to have

 

nActivationSum = map nActivation 

or am I missing your intent here?

Note that on the left-hand side of the last equation inputs would have to have type (Float, Float) and weights would have to have type [(Float,Float)], but on the right-hand side both inputs and weights have to be Float.  The result of  

nActivation (inputs, weights) is Float, but the result of 

nActivationSum (inputs:weights) should be [(Float,Float)], hence the error message.

:: paul

On 2013-04-14, at 16:04 , Miro Karpis wrote:

Please can you help me with this? What I want is to have on input a list of tuple (size 2) and on output list of floats. So now I'm returning only float instead of a list. But unfortunately I can't figure out how to implement the list......

sigmoid :: Float -> Float

sigmoid x = 1.0 / (1 + exp (-x))

nActivation :: (Float,Float) -> Float

nActivation (x,y) = sigmoid(x*y) 

nActivationSum :: [(Float, Float)] -> [Float]

nActivationSum [] = []

nActivationSum (inputs:weights) = nActivation (inputs, weights)

Couldn't match expected type `[Float]' with actual type `Float'

    In the return type of a call of `nActivation'

    In the expression: nActivation (inputs, weights)

    In an equation for `nActivationSum':

        nActivationSum (inputs : weights) = nActivation (inputs, weights)

thanks,

m.

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