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simplex

  

pivotvar

  

return a variable with positive coefficient

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

pivotvar(f, List)

pivotvar(f)

Parameters

f

-

objective function expressed in terms of non-basic variables relative to some description

List

-

list of the variables which occur in the problem

Description

• 

The function pivotvar(f, List) returns either a variable which has a positive coefficient or FAIL.  The optional List (of variable names) is used to determine the order in which the variables should be examined.  The first success is used. If no List is provided, then pivotvar chooses its own order.

• 

The command with(simplex,pivotvar) allows the use of the abbreviated form of this command.

Examples

withsimplex:

pivotvarx1+3x3x4

x1

(1)

pivotvarx1+3x3x4,x4,x3,x1

x3

(2)

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