cplexAPI (version 1.4.0)

getGradCPLEX: Project the Impact of Making Changes to Optimal Variable Values or Objective Function Coefficients

Description

Low level interface function to the IBM ILOG CPLEX function CPXgetgrad. Consult the IBM ILOG CPLEX documentation for more detailed information.

Usage

getGradCPLEX(env, lp, j)

Arguments

env

An object of class "'>cplexPtr" as returned by openEnvCPLEX. This is basically a pointer to an IBM ILOG CPLEX environment.

lp

An object of class "'>cplexPtr" as returned by initProbCPLEX. This is basically a pointer to an IBM ILOG CPLEX problem object.

j

An integer specifying the index of the column of interest.

Value

If successful a list is returned:

head

listing of the indices of the basic variables in the order in which they appear in the basis.

y

coefficients of the j-th column relative to the current basis.

otherwise an instance of class "'>cplexError".

Details

Interface to the C function getGrad which calls the CPLEX function CPXgetgrad.

References

The IBM ILOG CPLEX home page at https://www.ibm.com/support/knowledgecenter/SSSA5P.