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Question: LPSolve bug in Maple 13?

Question:LPSolve bug in Maple 13?

xredor 5 Maple 13
October 05 2010
1

Problem of integer optimization

35*x+40*y+50*z -> min

.4*x+.5*y+.8*z >= 2

x,y,z are positive integers

 

When i call

> LPSolve(35*x+40*y+50*z, {x >= 0, y >= 0, z >= 0, .4*x+.5*y+.8*z >= 2}, assume = integer);
                        [135, [x = 1, y = 0, z = 2]] -- right solution

 

When i call
> LPSolve(35*x+40*y+50*z, {.4*x+.5*y+.8*z >= 2}, assume = integer);
Warning, problem appears to be unbounded
                        [150, [x = 0, y = 0, z = 3]] - wrong solution

 

Is it a bug?
Please Wait...