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Today's Topics:
1. Re: Category Theory (Matt Andrew)
2. database: haskelldb, hdbc, hsql (prad)
3. docstring equivalent (prad)
4. Hint on exercise from Real World Haskell (Chris Saunders)
5. Re: Hint on exercise from Real World Haskell (MAN)
6. Re: Hint on exercise from Real World Haskell (Daniel Fischer)
7. Re: Hint on exercise from Real World Haskell (prad)
8. Re: docstring equivalent (Stephen Tetley)
9. Re: docstring equivalent (prad)
10. Functional Programming in Finance (Syed Imran)
----------------------------------------------------------------------
Message: 1
Date: Tue, 29 Jun 2010 09:15:49 +1000
From: Matt Andrew <mjsa...@gmail.com>
Subject: Re: [Haskell-beginners] Category Theory
To: Paul Higham <polyg...@mac.com>
Cc: beginners@haskell.org
Message-ID: <m1vd92px3u.wl%mjsa...@gmail.com>
Content-Type: text/plain; charset=US-ASCII
Hi Paul,
Thanks a lot for the reply, it's been very helpful in clarifying some of the
stuff I was struggling with. Appreciate you taking the time to answer.
Matt
------------------------------
Message: 2
Date: Mon, 28 Jun 2010 16:56:05 -0700
From: prad <p...@towardsfreedom.com>
Subject: [Haskell-beginners] database: haskelldb, hdbc, hsql
To: haskellbeginners <beginners@haskell.org>
Message-ID: <20100628165605.2ed03...@gom>
Content-Type: text/plain; charset=US-ASCII
after spending some time looking into db access through haskell, it
seems there are these 3.
realworld haskell showed be how to use hdbc and sqlite3 (and i almost
got things working there)
can't figure out what hsql is yet though i suspect it is similar to
hdbc.
haskelldb looks like it lets you code in something that doesn't
resemble sql. it also seems to sit on top of the other two.
so my question is which one should i persue and why?
most of my stuff will be done on postgresql (though i'm not averse to
using sqlite3 for smaller things).
--
In friendship,
prad
... with you on your journey
Towards Freedom
http://www.towardsfreedom.com (website)
Information, Inspiration, Imagination - truly a site for soaring I's
------------------------------
Message: 3
Date: Mon, 28 Jun 2010 17:21:56 -0700
From: prad <p...@towardsfreedom.com>
Subject: [Haskell-beginners] docstring equivalent
To: haskellbeginners <beginners@haskell.org>
Message-ID: <20100628172156.4871f...@gom>
Content-Type: text/plain; charset=US-ASCII
in python you can get info about a function or class because they are
docstringed. is there some equivalent mechanism for haskell usable in
ghci?
--
In friendship,
prad
... with you on your journey
Towards Freedom
http://www.towardsfreedom.com (website)
Information, Inspiration, Imagination - truly a site for soaring I's
------------------------------
Message: 4
Date: Mon, 28 Jun 2010 22:45:23 -0400
From: "Chris Saunders" <e...@mountaincable.net>
Subject: [Haskell-beginners] Hint on exercise from Real World Haskell
To: "Haskell - Beginners" <beginners@haskell.org>
Message-ID: <7fbe37d3fd2f486da0a832b255290...@chrispc>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I have been working on the exercises from chapter 1 of Real World Haskell.
I seem to be stuck on a solution to:
4.Modify the WC.hs example again, to print the number of characters in a
file.
I'm hoping to get a hint for this one. I may request a solution later but
for now I would prefer just a hint.
Regards
Chris Saunders
------------------------------
Message: 5
Date: Mon, 28 Jun 2010 23:58:55 -0300
From: MAN <elviotoccal...@gmail.com>
Subject: Re: [Haskell-beginners] Hint on exercise from Real World
Haskell
To: Chris Saunders <e...@mountaincable.net>
Cc: Haskell - Beginners <beginners@haskell.org>
Message-ID: <1277780335.3028.4.ca...@dy-book>
Content-Type: text/plain; charset="UTF-8"
When you read a file (System.IO.readFile, for example) its content is
returned as a String... consider:
type String = [Char]
What function would you use to count the elements in a list?
El lun, 28-06-2010 a las 22:45 -0400, Chris Saunders escribió:
> I have been working on the exercises from chapter 1 of Real World Haskell.
> I seem to be stuck on a solution to:
>
> 4.Modify the WC.hs example again, to print the number of characters in a
> file.
>
> I'm hoping to get a hint for this one. I may request a solution later but
> for now I would prefer just a hint.
>
> Regards
> Chris Saunders
>
> _______________________________________________
> Beginners mailing list
> Beginners@haskell.org
> http://www.haskell.org/mailman/listinfo/beginners
------------------------------
Message: 6
Date: Tue, 29 Jun 2010 05:02:43 +0200
From: Daniel Fischer <daniel.is.fisc...@web.de>
Subject: Re: [Haskell-beginners] Hint on exercise from Real World
Haskell
To: beginners@haskell.org
Message-ID: <201006290502.43333.daniel.is.fisc...@web.de>
Content-Type: text/plain; charset="iso-8859-1"
On Tuesday 29 June 2010 04:45:23, Chris Saunders wrote:
> I have been working on the exercises from chapter 1 of Real World
> Haskell. I seem to be stuck on a solution to:
>
> 4.Modify the WC.hs example again, to print the number of characters in a
> file.
>
> I'm hoping to get a hint for this one. I may request a solution later
> but for now I would prefer just a hint.
Have you done ex. 3: The words function counts the number of words in a
string. Modify the WC.hs example to count the number of words in a file. ?
Originally, WC uses lines to break a String into a list of lines.
Then you use words to break a String into a list of words.
Now you want to make a list of characters out of the String.
How do you do that again?
>
> Regards
> Chris Saunders
>
------------------------------
Message: 7
Date: Mon, 28 Jun 2010 21:31:19 -0700
From: prad <p...@towardsfreedom.com>
Subject: [Haskell-beginners] Re: Hint on exercise from Real World
Haskell
To: beginners@haskell.org
Message-ID: <20100628213119.0a7a2...@gom>
Content-Type: text/plain; charset=US-ASCII
On Mon, 28 Jun 2010 22:45:23 -0400
"Chris Saunders" <e...@mountaincable.net> wrote:
> print the number of characters in a
> file ... I'm hoping to get a hint for this one.
>
1. read in the file - which will be (eventually) a bunch of chars
2. count the chars by adding 1 to the count of the chars less one char
(can be done with pattern matching x:xs and then using just xs)
--
In friendship,
prad
... with you on your journey
Towards Freedom
http://www.towardsfreedom.com (website)
Information, Inspiration, Imagination - truly a site for soaring I's
------------------------------
Message: 8
Date: Tue, 29 Jun 2010 07:48:21 +0100
From: Stephen Tetley <stephen.tet...@gmail.com>
Subject: Re: [Haskell-beginners] docstring equivalent
To: prad <p...@towardsfreedom.com>
Cc: haskellbeginners <beginners@haskell.org>
Message-ID:
<aanlktilkz4hdyjaovar0zi_1z7ju7snbjxztiveqq...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Hello Prad
The info command will give you details of a function - its type
signature and the module where it is defined, its fixity if it is an
infix function:
Prelude> :info length
length :: [a] -> Int -- Defined in GHC.List
The shorthand is :i
Prelude> :i (>>=)
class Monad m where
(>>=) :: m a -> (a -> m b) -> m b
...
-- Defined in GHC.Base
infixl 1 >>=
For constructors, info will tell you which data type the constructor
belongs to and the module where it is defined:
Prelude> :i Just
data Maybe a = ... | Just a -- Defined in Data.Maybe
There is no mechanism like docstring in Haskell though - the
information displayed by the info command is not customizable.
Best wishes
Stephen
------------------------------
Message: 9
Date: Mon, 28 Jun 2010 23:57:43 -0700
From: prad <p...@towardsfreedom.com>
Subject: [Haskell-beginners] Re: docstring equivalent
To: beginners@haskell.org
Message-ID: <20100628235743.34aed...@gom>
Content-Type: text/plain; charset=US-ASCII
On Tue, 29 Jun 2010 07:48:21 +0100
Stephen Tetley <stephen.tet...@gmail.com> wrote:
> There is no mechanism like docstring in Haskell though
>
that's what i thought.
thx for the scoop on info though, stephen.
i found this site quite helpful for lookups:
http://www.zvon.org/comp/r/ref-Haskell.html#
(lots of good examples here too quite often!)
and hackageDB does provide a lot of info on the specific functions that
are there:
http://hackage.haskell.org/packages/hackage.html
--
In friendship,
prad
... with you on your journey
Towards Freedom
http://www.towardsfreedom.com (website)
Information, Inspiration, Imagination - truly a site for soaring I's
------------------------------
Message: 10
Date: Mon, 28 Jun 2010 14:45:15 +0100
From: Syed Imran <s.im...@carringtonfox.com>
Subject: [Haskell-beginners] Functional Programming in Finance
To: "beginners@haskell.org" <beginners@haskell.org>
Message-ID:
<38f4bf79effc994494a04a6ca5e31bb04f35d8a...@pal-exc-1.palmarium.local>
Content-Type: text/plain; charset="us-ascii"
Hi,
I hope you are well.
I am a Head Hunter in the City of London, I have recently joined the
Haskell-Cafe forum.
I am currently looking for someone with a strong computer science or
mathematical background to work with some of the leading financial institutions
in London and the USA. Functional Programming is seeing a significant amount of
investment with a few of our clients, who are using Haskell as well as F# (and
some also use OCaml).
I appreciate you may not be actively looking to work in the investment banking
arena at present however I would be keen to touch base with you should you be
interest now or in the future.
Please could you let me know your current situation and also forward me a copy
of your CV and contact number so as I can call.
Look forward to hearing from you.
Kindest Regards
Syed Imran
Consultant
Carrington Fox UK Ltd.
11 Tokenhouse Yard
London
EC2R 7AS
Tel: +44 207 073 2626
Fax: +44 207 073 2627
s.im...@carringtonfox.com<mailto:s.im...@carringtonfox.com>
www.carringtonfox.com<http://www.carringtonfox.com>
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