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problem.rhssa

problem.rhssa

Purpose
Returns upper and lower sensitivity ranges for specified right hand side (RHS) function coefficients. If the RHS coefficients are varied within these ranges the current basis remains optimal and the reduced costs remain valid.
Synopsis
problem.rhssa (mindex, lower, upper)
Arguments
mindex 
Array containing the rows (i.e. xpress.constraint objects, indices, or names) whose RHS coefficients sensitivity ranges are required.
lower 
Array where the RHS lower range values are to be returned.
upper 
Array where the RHS upper range values are to be returned.
Example
Here we obtain the RHS function ranges for the three columns: 2, 6 and 8: 
l = []
u = []
p.rhssa ([2,8,6], l, u)
After which lower and upper contain: 
l = [5, 3.8, 5.7]
u = [7, 5.2, 1e+20]
Meaning that the current basis remains optimal when 5.0 ≤ rhs 2, 3.8 ≤ rhs 8 ≤ 5.2 and 5.7 ≤ rhs 6, rhs i being the RHS coefficient of row i.
Further information
rhssa can only be called when an optimal solution to the current LP has been found. It cannot be used when the problem is MIP presolved.
Related topics
problem.objsa.

Parent Topic Reference Manual

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