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[Bug-glpk] Unscaled constraint matrix condition reporting (suggestion)


From: Robbie Morrison
Subject: [Bug-glpk] Unscaled constraint matrix condition reporting (suggestion)
Date: Sat, 7 May 2011 02:26:45 +1200 (NZST)
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Hello all

Following up on my recent bug report and after some
more experimentation .. it seems poor scaling is an issue.

However no condition information is given when scaling
is omitted (as far as I can tell).  Perhaps it would be
better to report that by default.  An example would be:

...
100 lines were read
Original constraint matrix condition
 A: min|aij| =  1.852e-04  max|aij| =  1.000e+07  ratio =  5.400e+10
Constructing initial basis..
...

with best wishes, Robbie
---
Robbie Morrison
PhD student -- policy-oriented energy system simulation
Technical University of Berlin (TU-Berlin), Germany
University email (redirected) : address@hidden
Webmail (preferred)           : address@hidden
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