Javran

realworldFunc x = x * 0.5 + 1.23

dataSize = 100

dataSet = take dataSize $ map (\x -> (x,realworldFunc x)) [1..]

gdAlgo alpha (initT0, initT1) = (newT0,newT1)
    where
        hypo x = x * initT1 + initT0
        newT0 = initT0 - theConst * (sum theDiffs)