Haskell help!
Weix, Rachel Lynn
weixrl@uwec.edu
Wed, 26 Mar 2003 16:30:08 -0600
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Currently I'm having problems with type checking due to Haskell being a =
strongly typed language. In order to return all optimal solutions, my =
professor suggested I create a list of tuples if they all have the same =
score, as indicated in my new maxSeq method (see attachment). However, =
this means that the maxSeq method would return type [[(Char,Char)]]. =
Since maxSeq and getSeq must return the same type, I end up changing all =
my signatures and end up with lots of problems. In my caseX methods, I =
can't append [(Char)] to [[(Char,Char)]], and it also messes up trying =
to get my score of each tuple, etc. I've been trying to solve the =
problem in Scheme first but even then I'm having problems, and Scheme is =
only loosely typed. Any suggestions? The format should be something =
like the following (partial example):
=20
[ [(-,M)] [(T,a)(h,s)(-,t)(e,e)(-,r)(-,s)] =
[(-,s)(h,t)(e,e)(-,r)(-,s)]]].=20
=20
Once I get back my list, I need to pair everything up in order to return =
a list of optimal solutions. Taking the previous example, it would be =
the following when paired up correctly:
=20
[ [(-,M)(T,a)(h,s)(-,t)(e,e)(-,r)(-,s)], =
[(-,M)(T,a)(-,s)(h,t)(e,e)(-,r)(-,s)] ]=20
=20
>From there, I find which sequence has the maximum score. I then walk =
through the list again, making a list of all the sequences that have =
that score. These two steps seem fairly trivial, it's all the above =
stuff which I'm struggling on.
=20
Rachel
=20
-----Original Message-----=20
From: Marc Ziegert [mailto:coeus@gmx.de]=20
Sent: Tue 3/25/2003 3:13 PM=20
To: Weix, Rachel Lynn=20
Cc:=20
Subject: Re: Haskell help!
maxSeq had one mistake: || instead of &&
=09
i will think about the problem itself, before rewriting all.
=09
this is the file a little bit more in haskell style.
=09
=09
=09
Am Dienstag, 25. M=E4rz 2003 20:16 schrieben Sie:
> I found my two mistakes, plus I fixed the method my Professor said =
was
> incorrect. Now I just have to be able to find ALL optimal solutions,
> instead of just one. Hooray!
>
> Rachel
=09
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<BODY dir=3Dltr>=0A=
<DIV>Currently I'm having problems with type checking due to Haskell =
being a =0A=
strongly typed language. In order to return all optimal solutions, =
my =0A=
professor suggested I create a list of tuples if they all have the same =
score, =0A=
as indicated in my new maxSeq method (see attachment). However, =
this means =0A=
that the maxSeq method would return type [[(Char,Char)]]. =
Since =0A=
maxSeq and getSeq must return the same type, I end up changing all my =
signatures =0A=
and end up with lots of problems. In my caseX methods, I can't =
append =0A=
[(Char)] to [[(Char,Char)]], and it also messes up trying to get my =
score of =0A=
each tuple, etc. I've been trying to solve the problem in Scheme =
first but =0A=
even then I'm having problems, and Scheme is only loosely typed. =
Any =0A=
suggestions? The format should be something like the following =
(partial =0A=
example):</DIV>=0A=
<DIV> </DIV>=0A=
<DIV>[ [(-,M)] [(T,a)(h,s)(-,t)(e,e)(-,r)(-,s)] =0A=
[(-,s)(h,t)(e,e)(-,r)(-,s)]]]. </DIV>=0A=
<DIV> </DIV>=0A=
<DIV>Once I get back my list, I need to pair everything up in order to =
return a =0A=
list of optimal solutions. Taking the previous example, it would =
be the =0A=
following when paired up correctly:</DIV>=0A=
<DIV> </DIV>=0A=
<DIV>[ [(-,M)(T,a)(h,s)(-,t)(e,e)(-,r)(-,s)], =0A=
[(-,M)(T,a)(-,s)(h,t)(e,e)(-,r)(-,s)] ] </DIV>=0A=
<DIV> </DIV>=0A=
<DIV>From there, I find which sequence has the maximum score. I =
then walk =0A=
through the list again, making a list of all the sequences that have =
that =0A=
score. These two steps seem fairly trivial, it's all the above =
stuff which =0A=
I'm struggling on.</DIV>=0A=
<DIV> </DIV>=0A=
<DIV>Rachel</DIV>=0A=
<DIV> </DIV>=0A=
<DIV><FONT size=3D2>-----Original Message----- <BR><B>From:</B> Marc =
Ziegert =0A=
[mailto:coeus@gmx.de] <BR><B>Sent:</B> Tue 3/25/2003 3:13 PM =
<BR><B>To:</B> =0A=
Weix, Rachel Lynn <BR><B>Cc:</B> <BR><B>Subject:</B> Re: Haskell =0A=
help!<BR><BR></DIV></FONT>=0A=
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">=0A=
<P><FONT size=3D2>maxSeq had one mistake: || instead of =
&&<BR><BR>i will =0A=
think about the problem itself, before rewriting all.<BR><BR>this is =
the file =0A=
a little bit more in haskell style.<BR><BR><BR><BR>Am Dienstag, 25. =
M=E4rz 2003 =0A=
20:16 schrieben Sie:<BR>> I found my two mistakes, plus I fixed the =
method =0A=
my Professor said was<BR>> incorrect. Now I just have to be =
able to =0A=
find ALL optimal solutions,<BR>> instead of just one. =0A=
Hooray!<BR>><BR>> Rachel<BR></FONT></P></BLOCKQUOTE>=0A=
=0A=
</BODY>=0A=
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