Am Donnerstag, 8. Mai 2008 15:36 schrieb [EMAIL PROTECTED]: > Hi I have a bit of a dilemma.I have a list of lists, eg, > [[1,2,3],[4,5,6],[7,8,9]]. Imagine they represent a grid with 0-2 on the x > axis and 0-2 on the y axis, eg, (0,0) is 1, (1,0) is 2, (2,1) is 6, etc and > (2,3) is 9. I want to be able to put in the list of lists, and the (x,y) > coordinate, and return the value. > > Also, I need to be able to replace a value in the list. Eg, if I wanted to > replace (2,3) with 100, then the output of the expression would be > [[1,2,3],[4,5,6],[7,8,100]]. > > Any help would be great!
To get the value at a position, look up (!!) To replace a value, you could use zipWith _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe