Re: [Haskell-cafe] Matlab Style Logic Operations ala V1.*(V2>0) on Vectors and Matrices with HMatrix ??

On Sat, 25 Dec 2010, gutti wrote:

this line works :

matrixfunction x y = liftMatrix2 (zipVectorWith(\a1 a2 -> if a2>=0 then a1 else 0)) x y

but when I use this line :

matrixfunction f x y = liftMatrix2 (zipVectorWith f) x y

how can / do I have to define f in a seperate line a way, that it works and gives the same result ?

The same way you have literally replaced (\a1 a2 -> if a2>=0 then a1 else 0) by 'f' at the right hand side, you can use that phrase as argument to the parameter 'f': matrixfunction (\a1 a2 -> if a2>=0 then a1 else 0) x y The lambda expression (\ ...) really is just a notation for a function.