map with lists based on conditions

[Philip Sivyer]

Hi - newbie

Is it possible to use a condition on a list using map eg

 

map (*4) [1,2,3,4,5,4,3,2,1,20]

[4,8,12,16,20,16,12,8,4,80]

 

 

..... what I would like to achieve is that if the number in the list is <4 then map (*4) [1,2,3,4,5,4,3,2,1,20] else if  the number in the list is between 4 & 5 then map (/4) [1,2,3,4,5,4,3,2,1,20]

else map (+4) [1,2,3,4,5,4,3,2,1,20]

 

so, my result would be..

>[4,8,12,1,1.25 ,1,12,8,4,24]

 

or maybe map is not the answer?

 

Regards

[Philip Sivyer]

Hi

I've answered my own question .... would appreciate comments if better way.

 

Regards

 

listManip n | n <4                   = n*4
                  | n >3 && n < 6    = n/4
                  | otherwise           = n+4

 

listManip1 = [1,2,3,4,5,4,3,2,1,20]

main = do 
print(map (listManip) listManip1)