Is this sort of a constraint implementable in Python?

Newsgroups	comp.lang.python
Date	2014-06-10 02:12 -0700
Message-ID	<7d4f1623-35c1-42b5-bbbb-a4a045b60b19@googlegroups.com> (permalink)
Subject	Is this sort of a constraint implementable in Python?
From	varun7rs@gmail.com

Show all headers | View raw

Hello Everyone,

I'm working on a python code to input matrices into CPLEX solver. I have most of my code running fine but as of now, I don't know how to express this constraint. My objective is to minimize the number of nodes. I have got one of the weirdest looking constraints which I don't know how to express in Python because python basically takes matrices and inputs them into cplex. My constraint is as below. This was what I wrote in AMPL

minimize phy_nodes: sum {w in PHY_NODES} x_ns[w] ;

s.t. Phy_nodes_Eq{w in PHY_NODES, dns in DEMAND}:
x_ns[w] = 1 ==> x_SGW[dns, w] + x_PGW[dns, w] + x_MME[dns, w] + x_IMS[dns, w] + x_PoP[dns, w] >= 1
else x_SGW[dns, w] + x_PGW[dns, w] + x_MME[dns, w] + x_IMS[dns, w] + x_PoP[dns, w] = 0;
Could you help me fix this problem? 

Thank You

Back to comp.lang.python | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Is this sort of a constraint implementable in Python? varun7rs@gmail.com - 2014-06-10 02:12 -0700
  Re: Is this sort of a constraint implementable in Python? Gary Herron <gary.herron@islandtraining.com> - 2014-06-10 13:06 -0700

csiph-web