By David G. Luenberger, Yinyu Ye

ISBN-10: 0387745025

ISBN-13: 9780387745022

This 3rd version of the vintage textbook in Optimization has been absolutely revised and up to date. It comprehensively covers smooth theoretical insights during this the most important computing quarter, and may be required analyzing for analysts and operations researchers in a number of fields. The e-book connects the basically analytical personality of an optimization challenge, and the habit of algorithms used to unravel it. Now, the 3rd version has been thoroughly up to date with contemporary Optimization equipment. The booklet additionally has a brand new co-author, Yinyu Ye of California’s Stanford collage, who has written plenty of additional fabric together with a few on inside element equipment.

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Download e-book for iPad: Linear and Nonlinear Programming, Third Edition by David G. Luenberger, Yinyu Ye

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Extra resources for Linear and Nonlinear Programming, Third Edition

Example text

Thus, the last row can be treated operationally like any other row: just start with cj ’s and reduce the terms corresponding to basic variables to zero by row operations. After a column q is selected in which to pivot, the final selection of the pivot element is made by computing the ratio yi0 /yiq for the positive elements yiq , i=1 2 m, of the qth column and selecting the element p yielding the minimum ratio. Pivoting on this element will maintain feasibility as well as (assuming nondegeneracy) decrease the value of the objective function.

This theorem reduces the task of solving a linear program to that of searching over basic feasible solutions. Since for a problem having n variables and m constraints there are at most n! n = m m! n − m ! basic solutions (corresponding to the number of ways of selecting m of n columns), there are only a finite number of possibilities. Thus the fundamental theorem yields an obvious, but terribly inefficient, finite search technique. By expanding upon the technique of proof as well as the statement of the fundamental theorem, the efficient simplex procedure is derived.

When degenerate solutions are encountered, the simplex procedure generally does not enter a cycle. However, anticycling procedures are simple, and many codes incorporate such a procedure for the sake of safety. 5 Chapter 3 The Simplex Method ARTIFICIAL VARIABLES A basic feasible solution is sometimes immediately available for linear programs. For example, in problems with constraints of the form Ax b x 0 (26) with b 0, a basic feasible solution to the corresponding standard form of the problem is provided by the slack variables.

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