Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed2a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.005
X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'python.': 0.02; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'teh': 0.09; 'wrote': 0.14; '(1,': 0.16; '......': 0.16; 'dist,': 0.16; 'equation': 0.16; 'equation.': 0.16; 'loops': 0.16; 'number?': 0.16; 'received:80.91.229.3': 0.16; 'received:97': 0.16; 'received:plane.gmane.org': 0.16; 'meant': 0.20; 'mathematical': 0.24; 'unicode': 0.24; 'looks': 0.24; 'header:X-Complaints-To:1': 0.27; 'function': 0.29; 'appear': 0.29; 'sets': 0.30; "i'm": 0.30; 'are.': 0.31; 'text': 0.33; 'could': 0.34; 'message.': 0.35; 'problem': 0.35; 'form.': 0.35; 'really': 0.36; 'indexed': 0.36; 'representing': 0.36; 'example,': 0.37; 'so,': 0.37; 'expressed': 0.37; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'how': 0.40; 'numbers': 0.61; 'email addr:gmail.com': 0.63; 'different': 0.65; 'here': 0.66; 'sample': 0.67; 'side': 0.67; 'presumably': 0.84; 'subject::': 0.85
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Dave Angel <davea@davea.name>
Subject: Re:Representing mathematical equations
Date: Mon, 6 Oct 2014 08:50:48 -0400 (EDT)
Organization: news.gmane.org
References: <9ea5c61c-9f06-4bcb-982e-2be0a910b817@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-Gmane-NNTP-Posting-Host: 97.73.240.54
X-Newsreader: PiaoHong.Usenet.Client.VIP:1.62
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.14634.1412599694.18130.python-list@python.org>
Lines: 42
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1412599694 news.xs4all.nl 2884 [2001:888:2000:d::a6]:54661
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:78753

varun7rs@gmail.com Wrote in message:
> Hello,
> 
> I am working on a mathematical equation which I'm finding really hard to express in python. Could any of you spare some time to help me out?
> 
> The equation looks like this
> 
> b(i,x) = [Σ(l∈L) [bd(l) * dist(l) * hc(l)]]  / Σ(l∈L) l
> 
> I have a problem in representing the above equation. I don't know how to use teh loops over here to express b(i,x)
> 
> i,x,l are sets with different numbers
> 

Perhaps you meant  L is a set of numbers,  none repeated.  If you
 really meant l, I have no clue.

As for i and x, they don't appear on the right side so they're a
 red herring. 

I also don't know what bd, dist, and hc are. Are they each a
 function of a single number? Or are they vectors,  indexed by
 int? If so, then presumably L is a set of ints.

How about you express some sample data that you'd like to
 evaluate. For example,  start with
   L = set (1, 4, 3)
   bd = [4.3, 12.11, 93, -0.9, 42]
.....



> I'm sorry if the equation is not expressed in a standard form. I don't have LateX

No problem,  you did a good job expressing it in unicode in a text
 message. 

Ii Ll  1

-- 
DaveA