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Does Phase 1 of the 2 phase simplex algorithm remove all the redundant constraints of an L

Does Phase 1 of the 2 phase simplex algorithm remove all the redundantconstraints of an LP?I ask this question because my professor was talking about degeneracy,and it seemed that in most of the examples, it was because there was aredundant constraint. But he went on to say that there's no...

5 answers | 897 bytes |

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Earn a guaranteed income every month from home.No selling or recruiting, Immediate start!Get Paid for all completed work!Visit us today for details...

0 answers | 190 bytes |

Equation formation in GAMS

HiI am new to GAMS and want to write following equation in GAMS code.n n n nZ= ti xij + tij xiji=1 j=1 i=1 j=1I wrote it like this.z=e=sum((i, t(i) *sum(j,x( i,,j) ) )+ sum( (i,,j), t(i,,j) *x(i,,j));I am getting following errors.8 ')' expected10 ',' expected119 Number (prima...

1 answers | 464 bytes |

NO PRIMAL FEASIBLE SOLUTION

Dear All,I develop a movement model which will distribute grain optimally fromsurplus regions to deficit regions. Some regions will receive in largeamounts while others in small amounts. The distribution depends on theharvest periods, stock levels in senders & receivers, demand and theavailabili...

7 answers | 1332 bytes |

how to solve nonlinear equations and inequalities -- how to find feasible starting points

Hi all,Here is an optimization problem and we are using "fmincon" which is aconstrained local minimization solver in Matlab.However, I've found that the feasible region itself is very irregular. objective function involves mostly nonlinear functions with logs andsqrts and exponentials, and...

1 answers | 1318 bytes |

Need Help writing VBA in Excel to run LINGO with multiple datasets

Hi. I'm a newbie to LING and a grad student working on a nonlinearoptimization problem for my dissertation. My toy network problem runsfine in LINGNow I want to explore the sensitivity of the outputs to changes in theinputs by running many (100) different data sets per variable per toynetwo...

3 answers | 716 bytes |

Need Help writing VBA in Excel to run LINGO with multiple datasets

2 answers | 716 bytes |

How to generate LP/MPS file in OPL Studio 3.7

Hi everyone,Please give me some hint on this seemingly trivial question. I amtotally new to PL, and I can't seem to find a menu command for thissimple task. Thank you very much in advance!Best,Loan....

1 answers | 254 bytes |

How to get an integer optimal solution?

When there are a set of optimal solutions consisting of some solutionswhere all variables have integer values and the other solutions wheresome variables have fractional values and the others don't, how can wemake CPLEX generate (produce) one of the integer solutions?Are there any special m...

0 answers | 509 bytes |

AMPL Modelling Workshop: Linear & Integer Programming/Stochastic Programming

Apologies for cross-sendingDear colleagues,We are pleased to bring you the following workshops, Series: Business Applications of , StochasticProgramming and Portfolio Planning* Introduction to and its Applications: Linear & IntegerProgramming - Embedded DSS using SCRIPTING and CM ,16 - 17 , CARI...

0 answers | 2031 bytes |

Explanation of Bender's Decomposition Method

Hi,I was reading about bender's decompostion method, had some doubts butnone of the links I got while googling cleared my doubts. Hope thatsome one can explain in detail (if possible) the following :What is the reason behind adding cuts to the master problem?-I do understand that it will he...

5 answers | 844 bytes |

hbb"-0.000000" in the output

Hello,I used Cplex Interactive Tool to solve an integer programmingproblem. Then use "display sol var -" to display the results. I foundthat some variables are "0.000000" and other variables are "-0.000000".What does "-0.000000" mean?Thanks...

2 answers | 287 bytes |

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