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[Help-glpk] [Fwd: Re: sensitivity analysis table in glpk [NC]]
From: |
Andrew Makhorin |
Subject: |
[Help-glpk] [Fwd: Re: sensitivity analysis table in glpk [NC]] |
Date: |
Fri, 02 Nov 2012 19:36:55 +0400 |
-------- Forwarded Message --------
From: Minh Hoang <address@hidden>
To: address@hidden
Cc: address@hidden
Subject: Re: [Help-glpk] sensitivity analysis table in glpk [NC]
Date: Fri, 2 Nov 2012 15:19:19 -0000
Classification: NPL Management Ltd - Commercial
Hi Andrew,
The information in sensitivity analysis table in glpk seems to be incorrect.
For example: for the problem in sample.c file and in the manual section 1.3.1
(page 14).
The sen.txt file would be
------------------------------------------------------------------------------------------------------------
GLPK 4.47 - SENSITIVITY ANALYSIS REPORT
Page 1
Problem: sample
Objective: 733.3333333 (MAXimum)
No. Row name St Activity Slack Lower bound Activity
Obj coef Obj value at Limiting
Marginal Upper bound range
range break point variable
------ ------------ -- ------------- ------------- ------------- -------------
------------- ------------- ------------
1 p NU 100.00000 . -Inf 60.00000
-3.33333 600.00000 x2
3.33333 100.00000 150.00000
+Inf 900.00000 r
2 q NU 600.00000 . -Inf 400.00000
-.66667 600.00000 x1
.66667 600.00000 1000.00000
+Inf 1000.00000 x2
3 r BS 200.00000 100.00000 -Inf 120.00000
-1.66667 400.00000 p
.
300.00000 520.00000 .66667 866.66667 x3
GLPK 4.47 - SENSITIVITY ANALYSIS REPORT
Page 2
Problem: sample
Objective: 733.3333333 (MAXimum)
No. Column name St Activity Obj coef Lower bound Activity
Obj coef Obj value at Limiting
Marginal Upper bound range
range break point variable
------ ------------ -- ------------- ------------- ------------- -------------
------------- ------------- ------------
1 x1 BS 33.33333 10.00000 . -Inf
6.00000 600.00000 q
. +Inf 60.00000
15.00000 900.00000 p
2 x2 BS 66.66667 6.00000 . -Inf
4.00000 600.00000 p
. +Inf 100.00000
10.00000 1000.00000 q
3 x3 NL . 4.00000 . -Inf
-Inf +Inf
-2.66667 +Inf 25.00000
6.66667 666.66667 r
End of report
--------------------------------------------------------------------------------------------------------
However the correct range of the row r would be 200-> +inf not (120-> 520).
Do I miss something here?
Many thanks,
Minh
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- [Help-glpk] [Fwd: Re: sensitivity analysis table in glpk [NC]],
Andrew Makhorin <=