<p dir="ltr">Hi Douglas, I just worked through this problem myself over the weekend. are you doing this course by chance?<a href="http://interactivepython.org/runestone/static/pythonds/index.html"> http://interactivepython.org/runestone/static/pythonds/index.html</a></p>
<p dir="ltr">Anyway, could you share a link to your code? Hard to make suggestions without seeing it.</p>
<p dir="ltr">-Aziz</p>
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Today's Topics:<br>
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1. Re: Question about using Sympy. (Joshua Herman)<br>
2. Problems with Merge Sort??? (Lewit, Douglas)<br>
3. Not exactly a solution, but.... (Lewit, Douglas)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Sun, 14 Jun 2015 19:38:03 -0500<br>
From: Joshua Herman <<a href="mailto:zitterbewegung@gmail.com">zitterbewegung@gmail.com</a>><br>
To: The Chicago Python Users Group <<a href="mailto:chicago@python.org">chicago@python.org</a>><br>
Subject: Re: [Chicago] Question about using Sympy.<br>
Message-ID:<br>
<<a href="mailto:CAB3V1zmkq_Lj_nitb1PkZk%2Bm6PtrH0Dq824zBVPBgWf7NbszxQ@mail.gmail.com">CAB3V1zmkq_Lj_nitb1PkZk+m6PtrH0Dq824zBVPBgWf7NbszxQ@mail.gmail.com</a>><br>
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<br>
>From the documentation<br>
<a href="http://docs.sympy.org/dev/modules/solvers/solvers.html#module-sympy.solvers.recurr" rel="noreferrer" target="_blank">http://docs.sympy.org/dev/modules/solvers/solvers.html#module-sympy.solvers.recurr</a><br>
<br>
On Thu, Jun 11, 2015 at 10:45 PM, Lewit, Douglas <<a href="mailto:d-lewit@neiu.edu">d-lewit@neiu.edu</a>> wrote:<br>
<br>
> Hi there Chipy Folks,<br>
><br>
> Just wondering if the sympy module has a builtin routine for solving<br>
> recurrence relations. If you know, please enlighten me. I know that Maple<br>
> and Mathematica have such routines--and they are pretty impressive. Just<br>
> wondering if the sympy module has something equivalent.<br>
><br>
> Thanks and I hope everyone in the group has a fun weekend. I'm looking<br>
> forward to Wednesday evening's meeting at Pumping Station One. I'll be<br>
> arriving right after my second Algorithms exam, so there's a chance I won't<br>
> be in a very happy mood! That course is just brutal. The prof got his<br>
> undergrad degree at Harvard and his PhD. at the University of Chicago. A<br>
> real genius.... and also extremely demanding! So wish me luck on that<br>
> exam! :-)<br>
><br>
> Warm regards,<br>
><br>
> Douglas.<br>
><br>
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Message: 2<br>
Date: Sun, 14 Jun 2015 23:31:24 -0500<br>
From: "Lewit, Douglas" <<a href="mailto:d-lewit@neiu.edu">d-lewit@neiu.edu</a>><br>
To: The Chicago Python Users Group <<a href="mailto:chicago@python.org">chicago@python.org</a>><br>
Subject: [Chicago] Problems with Merge Sort???<br>
Message-ID:<br>
<<a href="mailto:CAPdZZGz%2BU4FMwQZsvDbyWwmLp-t-pzWEK4GJwgO8q6aUsqD_xQ@mail.gmail.com">CAPdZZGz+U4FMwQZsvDbyWwmLp-t-pzWEK4GJwgO8q6aUsqD_xQ@mail.gmail.com</a>><br>
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<br>
Hey guys,<br>
<br>
I'm trying to master the merge sort algorithm and definitely experiencing<br>
some failure. My merge program works great. It takes two arrays, and<br>
assuming that they are already sorted, the two sorted arrays get merged<br>
together into one unified sorted array. So that's not the problem.<br>
<br>
The problem is my mergeSort program. I inserted a couple of print<br>
statements to print out the intermediate results of the recursion, and it<br>
appears that all my program does is break the array down into pieces and<br>
then rebuilds the pieces.... into the original array! (Could be worse I<br>
guess. No error messages! But the output is totally useless.) I'm<br>
honestly at a loss. I know I'm really close to the right solution, but<br>
there is something that I'm missing and I can't figure it out. I've been<br>
struggling with this for a couple days now, and I'm ready to give up. Can<br>
someone please enlighten me?<br>
<br>
Thanks!!!<br>
<br>
Best,<br>
<br>
Douglas.<br>
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Message: 3<br>
Date: Mon, 15 Jun 2015 02:29:32 -0500<br>
From: "Lewit, Douglas" <<a href="mailto:d-lewit@neiu.edu">d-lewit@neiu.edu</a>><br>
To: The Chicago Python Users Group <<a href="mailto:chicago@python.org">chicago@python.org</a>><br>
Subject: [Chicago] Not exactly a solution, but....<br>
Message-ID:<br>
<<a href="mailto:CAPdZZGw4CTKHdZYAuoL-dii9_Y4UExKsV1jYhO_st3Gm7xW_0Q@mail.gmail.com">CAPdZZGw4CTKHdZYAuoL-dii9_Y4UExKsV1jYhO_st3Gm7xW_0Q@mail.gmail.com</a>><br>
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<br>
I sort of got my mergeSort program to work, but the problem is that the<br>
algorithm isn't really mergeSort at all! It uses merge, but my algorithm<br>
is iterative rather than recursive, so it's not really a mergeSort. It's a<br>
merge-something, but not true mergeSort. Oh well. Any suggestions?<br>
Thanks!<br>
<br>
Best,<br>
<br>
Douglas.<br>
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