check.tb: Check for negative RHS values and repair tableau
Description
This function examines the b vector (i.e. target values). If any negative values are found,
then the elements matrix is repaired and appropriate labels and vectors are exchanged.
Usage
check.tb(tab)
Arguments
tab
An object of class 'llgptab' that is the modified simplex tableau
Value
An object of class 'llgptab' in which the index rows have been updated.
References
Ignizio, J. P. (1976). Goal Programming and Extensions, Lexington Books, D. C. Heath and Company.