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Operations Research Models and Methods
Computation Section
Subunit Linear/Integer Programming
 - Integer Variables

The change button is used to change the structure of the problem by changing the numbers of variables and/or constraints or by changing the integer nature of the variables. The solver option can also be changed.

The following result is obtained when all the variables are required to be integer. Note that the letter I precedes the index of each integer variable. For this case they are all integer.

  The LP/IP dialog has an entry that indicates the number of leading variables that are to be integer. The leading variables are those with the lowest indices. Variables other that the leading ones can be made integer by placing the letter I or any word beginning with I in the cells normally holding the variable indices. The image below shows the solution when the two leading variables are integer and P5 is made integer by placing the word "integer" in its index field.


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Operations Research Models and Methods
by Paul A. Jensen
Copyright 2004 - All rights reserved