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Today's Topics:
1. Re: Application of lookup function (Jeon-Young Kang)
2. debugging help (Dennis Raddle)
3. Re: debugging help (Magnus Therning)
4. Re: debugging help (Dennis Raddle)
----------------------------------------------------------------------
Message: 1
Date: Fri, 4 Dec 2015 17:16:55 -0500
From: Jeon-Young Kang <jykan...@gmail.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] Application of lookup function
Message-ID:
<CALWtiK8Xx9RMwBfzv=LHHcmHhCTG=6AajD8wF5=7vtuozud...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Thanks Alex.
I successfully implemented what I want by using 'elem'.
On Thu, Dec 3, 2015 at 11:50 PM, Alex Belanger <i.caught....@gmail.com>
wrote:
> The (`elem` members) function will tell you if the person is a member of
> members. You can then turn that boolean into your custom State type.
> On Dec 3, 2015 11:46 PM, "Jeon-Young Kang" <jykan...@gmail.com> wrote:
>
>> Hi all.
>>
>> I'd like to apply lookup function (Data.Map) for what I am working on.
>>
>> Here is my code.
>>
>> data Person = Person {personId :: Int, name = String}
>> data People = [Person]
>>
>> data State = InMembership | NoMemebership
>>
>> person1 = Person {1 = personId, "James" = name}
>> person2 = Person {2 = personId, "Tom" = name}
>>
>> members = People [person1, person2]
>>
>> class Belonging a where
>> belonging :: a -> [a] -> Bool -> State
>>
>> here is the problem...
>> I don't know how to get to know whether a person is belong to members.
>> I'd like to find it through a person's name.
>>
>> Can you suggest any examples??
>>
>> Sincerely,
>> Jeon
>>
>>
>>
>> _______________________________________________
>> Beginners mailing list
>> Beginners@haskell.org
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>>
>>
> _______________________________________________
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>
--
Department of Geography
State University of New York at Buffalo
jykan...@gmail.com
Jeon-Young Kang
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Message: 2
Date: Fri, 4 Dec 2015 16:50:22 -0800
From: Dennis Raddle <dennis.rad...@gmail.com>
To: Haskell Beginners <beginners@haskell.org>
Subject: [Haskell-beginners] debugging help
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I'm getting an error, printf not having enough arguments. I need to find
where this is happening, and I understand there are ways of getting a stack
trace, but apparently I need to compile for profiling. That means I need to
compile my one library dependency (Text.XML.Light) for profiling, I
believe. How do I do this? I'm on Windows and have only installed libraries
in the past with cabal.
D
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Message: 3
Date: Sat, 05 Dec 2015 09:11:10 +0100
From: Magnus Therning <mag...@therning.org>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] debugging help
Message-ID: <87bna58gdd....@therning.org>
Content-Type: text/plain; charset="us-ascii"
Dennis Raddle writes:
> I'm getting an error, printf not having enough arguments. I need to
> find where this is happening, and I understand there are ways of
> getting a stack trace, but apparently I need to compile for profiling.
> That means I need to compile my one library dependency
> (Text.XML.Light) for profiling, I believe. How do I do this? I'm on
> Windows and have only installed libraries in the past with cabal.
How many calls to `printf` do you actually have?
Wouldn't a search for all calls and a quick inspection of them be good
enough?
/M
--
Magnus Therning OpenPGP: 0xAB4DFBA4
email: mag...@therning.org jabber: mag...@therning.org
twitter: magthe http://therning.org/magnus
If our ideas of intellectual property are wrong, we must change them,
improve them and return them to their original purpose. When
intellectual property rules diminish the supply of new ideas, they
steal from all of us.
-- Andrew Brown, November 19, 2005, The Guardian
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Message: 4
Date: Sat, 5 Dec 2015 02:18:41 -0800
From: Dennis Raddle <dennis.rad...@gmail.com>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <beginners@haskell.org>
Subject: Re: [Haskell-beginners] debugging help
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I started by looking everywhere I thought I called printf in this
particular case, and couldn't find a single problematic printf. Given the
input I was using, I thought I knew where the printf was probably going to
be. But that failed, and there are hundreds throughout the rest of the
program. (I use them for generating output and warning/error messages--- I
happen to like the format string method of describing your output.)
Then I thought, I sure would like to learn more about the debugger and
profiling, so I thought it was worth asking. I never have gotten clear on
how to compile libraries for profiling.
While waiting for a reply here, it struck me where the printf was, and I
found it and solved the problem. So there's not an immediate need for the
stack trace.
D
On Sat, Dec 5, 2015 at 12:11 AM, Magnus Therning <mag...@therning.org>
wrote:
>
> Dennis Raddle writes:
>
> > I'm getting an error, printf not having enough arguments. I need to
> > find where this is happening, and I understand there are ways of
> > getting a stack trace, but apparently I need to compile for profiling.
> > That means I need to compile my one library dependency
> > (Text.XML.Light) for profiling, I believe. How do I do this? I'm on
> > Windows and have only installed libraries in the past with cabal.
>
> How many calls to `printf` do you actually have?
>
> Wouldn't a search for all calls and a quick inspection of them be good
> enough?
>
> /M
>
> --
> Magnus Therning OpenPGP: 0xAB4DFBA4
> email: mag...@therning.org jabber: mag...@therning.org
> twitter: magthe http://therning.org/magnus
>
> If our ideas of intellectual property are wrong, we must change them,
> improve them and return them to their original purpose. When
> intellectual property rules diminish the supply of new ideas, they
> steal from all of us.
> -- Andrew Brown, November 19, 2005, The Guardian
>
> _______________________________________________
> Beginners mailing list
> Beginners@haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
>
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