Haskell Matrix Question NEED HELP!
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    Question Haskell Matrix Question NEED HELP!

    hi I have a question about haskell coding.

    Matrices

    One of many ways to define matrices in Haskell is the list of matrix rows, where a row is a list of double precision oating point numbers:

    type Matrix=[[Double]]
    Using this type you should define the following functions (definition of dim is given as an inspirational example).

    dim :: Matrix -> (Int,Int) --returns matrix dimension (number of rows and columns)
    dim m = if (not.isMatrix) m then error "Not a matrix" else (length m, length (head m))

    isMatrix :: Matrix -> Bool --checks whether all rows have the same length
    isMatrix m = and [length (head m) == length a | a <- m]
    I have done upto here and I am stuck on multSM.

    multSM :: Double -> Matrix -> Matrix --multiplies a scalar and a matrix
    when I do:

    multSM d m = [[(b*a)| b<-[d], a<-(head m)]] or [map (*d) (head m)]
    ...I get (using Hugs):

    Main> multSM 3 [[2,3,4],[1,3,4],[6,3,0]]
    [[6.0,9.0,12.0]]
    So I solve 3 [2,3,4] but I do not know how to get the rest 3 [[1,3,4],[6,3,0].

    Please help me on this problem.

    These are rest of unsolved questions if anyone can help with:
    Last edited by inkwang; February 3rd, 2010 at 04:21 AM.

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