[Haskell-cafe] How to use arrays efficiently?

[Bulat Ziganshin]

Hello Lauri,

Friday, May 16, 2008, 5:45:50 PM, you wrote:

> Yes, of course. How blind of me. Here is one more question. 
> If you change IOUArray to IOArray and add $! in front of the two
> summations in the previous code, it still works correctly. 
> But can you do similar trick with Array and accumArray? I have
> tried to put $! in different places in the first code that I posted but nothing seems to work.

accumArray internally uses more or less the same code with imperative
array as you wrote. so if you replace accumArray with your
implementation with all those $! - it will work. otherwise you just
don't get any chance :)


-- 
Best regards,
 Bulat                            mailto:Bulat.Ziganshin at gmail.com