Melanie_Green
What are the limitations of list comprehension. I want to use listcomprehension to output the pattern below. So a mixture of a's and newline characters. The part im stuck at is creating arguments in the listcomprehension to stop at some point then execute next loop. Is it even possible to create the pattern below purely from list comprehension.Thankyou in advance.
a aa aaa
I'm not clear what you mean by the question. Why do you want to use list comprehensions? What if they aren't the best way of getting the result you want? You can write [a | b <- [replicate n 'a' | n <- [1..]], a <- b ++ "\n"] but does that "replicate" fail to meet your specification? If not, you can replace it with another list comprehension like this: [a | b <- [['a'| m <- [1..n]] | n <- [1..]], a <- b ++ "\n"] but at this point, comprehension is not what most people would get from reading the code. I'd say it was clearer to write concat [replicate n 'a' ++ "\n" | n <- [1..]] -- Jón Fairbairn Jon.Fairbairn@cl.cam.ac.uk http://www.chaos.org.uk/~jf/Stuff-I-dont-want.html (updated 2009-01-31)