Issue 87321 - Solver: Does not recognize unbounded model
Summary: Solver: Does not recognize unbounded model
Alias: None
Product: Calc
Classification: Application
Component: editing (show other issues)
Version: DEV300m3
Hardware: All All
: P3 Trivial (vote)
Target Milestone: ---
Assignee: AOO issues mailing list
QA Contact:
Depends on:
Reported: 2008-03-21 21:53 UTC by niederbayern
Modified: 2013-01-29 21:38 UTC (History)
2 users (show)

See Also:
Issue Type: DEFECT
Latest Confirmation in: ---
Developer Difficulty: ---


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Description niederbayern 2008-03-21 21:53:16 UTC
When the solver is not given any limiting conditions it does not recognize the
situation as an unbounded model.

Try this:

(1) Enter the formula =A2*2 into cell A1

(2) Open the Solver dialog (Tools - Solver...)

(3) Set "Target cell" to: $A$1

(4) Optimize result to: Maximum

(5) Set "By changing cells" to: $A$2

(6) Click "Solve"

Since the model is unbouded, Solver is supposed to show the "No Solution
Feedback" with this message: "The modell is unbounded." But instead, Solver
comes to a final result: 1.00E+030.
Comment 1 amy2008 2008-09-01 09:37:59 UTC
It's not the right way you used Solver.
For this model y = 2x, there is just one y value to x value, so the maximum of 
the model is y value too. It has nothing to do with the model  which is 
unbounded or not.
Comment 2 amy2008 2008-09-01 10:06:26 UTC
You're right. I misunderstand it.

Li Meiying
Comment 3 amy2008 2008-09-01 10:08:09 UTC
Add me