Haskell List of List problem

Im trying to change a particular particular list in a list of lists, Ive already defined the function which changes the list. But im not sure how to go about implementing this function into another function which changes that part of the list in a list of lists

The function im trying to define is in the form [[a]开发者_运维问答] -> a -> [[a]] where a defines the part in the list of lists in trying to change

You need something like

map (map yourchangeFunction) yourdata

if I understand your question correctly.