There's a very good StackOverflow question which covers this: "When is
memoization automatic in GHC?"[1]. I found it really cleared up the issue
for me.
[1]:
http://stackoverflow.com/questions/3951012/when-is-memoization-automatic-in-ghc-haskell
On Sat, Jun 15, 2013 at 9:13 PM, Clark Gaebel wro
Yes. In general, GHC won't CSE for you.
- Clark
On Saturday, June 15, 2013, Christopher Howard wrote:
> On 06/15/2013 04:39 PM, Tommy Thorn wrote:
> >
> >
> > There's not enough context to answer the specific question,
> > but lazy evaluation isn't magic and the answer is probably "no".
> >
>
On 06/15/2013 05:02 PM, Christopher Howard wrote:
> On 06/15/2013 04:39 PM, Tommy Thorn wrote:
>
> Perhaps to simplify the question somewhat with a simpler example.
> Suppose you have
>
> code:
>
> let f x = if (x > 4) then f 0 else (sin x + 2 * cos x) : f (x + 1)
>
>
> After c
On 06/15/2013 04:39 PM, Tommy Thorn wrote:
>
>
> There's not enough context to answer the specific question,
> but lazy evaluation isn't magic and the answer is probably "no".
>
> Tommy
>
Perhaps to simplify the question somewhat with a simpler example.
Suppose you have
code:
let f x
I expect you'll get many replies...
> row (Grid s l) n = if (n >= s) then [] else l !! n
>
> col g@(Grid s l) n = if (n >= s) then [] else col_ g n 0
>where col_ (Grid s l) n i = if (i >= s) then [] else (head l !! n) :
> col_ (Grid s (tail l)) n (i + 1)
While such low-level approach (focus
I'm working through some beginner-level "keyboard problems" I found at
users.csc.calpoly.edu. One problem is the Saddle Points problem:
quote:
Write a program to search for the "saddle points" in a 5 by 5 array of
integers. A saddle point is a cell whose value is greater than or equal
to
When ghc-pkg observes your cache is out of date, it displays a helpful
warning, recommending "ghc-pkg recache". However, sometimes running this
command does not fix the problem, because it targets the wrong cache.
For out of date global caches, "ghc-pkg --global recache" successfully
clears the wa
As a side note, I have stopped having cabal issues since I started using
hsenv. It sandboxes packages for you. So if you have install problems you
just need to delete a local .hsenv directory instead of reinstalling
everything.
On Jun 12, 2013 11:15 PM, "Richard A. O'Keefe" wrote:
> My original p
Hello, everyone.
I am in need of setting up custom exception handlers when using GHC
API to compile modules. Right now I have the following piece of code:
* Main.hs:
--
import GHC
import GHC.Paths
impo
