[Haskell-cafe] Haskell, C and Matrix Multiplication

[John Lato]

Rather than commenting on the code provided, here are the two biggest wins
I've had recently with Haskell.  Both of these are part of a physical
modeling project.

1) uu-parsinglib - simple to use and automatic error correction.  I really,
really enjoy working with this library, and how often can you say that?

2) STM - the original design reads a system and all inputs from a config
file, then runs the system and produces output.  I wanted to build the
system from a file but collect inputs and produce output in real-time.
 After a few small adjustments, a few TVar's and a TMVar, and three
forkIO's, it was working.

One concern is that the engine (which is computation-intensive) shouldn't
block waiting for input, it should just continue on and catch up later.
 With STM, this can be expressed as:

atomically $ getInputs inputTVar `orElse` return ()

and there's the desired behavior.  Couldn't be easier.

John


From: Blake Rain <blake.rain at gmail.com>
>
> Dear Haskellers,
>
> I thought I'd take some time to share something of my weekend with
> you  all.   Not because  of  anything new,  but  because  it is  a
> feel-good example  of Haskell  being win. A  good read  for Monday
> morning, perhaps.
>

<code snipped>


> Now over to you guys! What experiences have you had which make you
> glad you use Haskell? Anything make you smile recently?
>
> - Blake
>
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