CPXchgbds

Description

The routine CPXchgbds() is used to change the upper or lower bounds on a set of variables of a problem. Several bounds can be changed at once, with each bound specified by the index of the variable with which it is associated. The value of a variable can be fixed at one value by setting the upper and lower bounds to the same value.

Return Value

The routine returns a zero on success, and a nonzero if an error occurs.

Synopsis 

  int CPXchgbds (CPXCENVptr env,
                 CPXLPptr lp,
                 int cnt,
                 const int *indices,
                 const char *lu,
                 const double *bd);

Arguments

CPXCENVptr env

The pointer to the CPLEX environment as returned by CPXopenCPLEX().

CPXLPptr lp

A pointer to a CPLEX problem object as returned by CPXcreateprob().

int cnt

An integer that indicates the total number of bounds to be changed, and thus specifies the length of the arrays indices, lu, and bd.

const int *indices

An array of length cnt containing the numerical indices of the columns corresponding to the variables for which bounds are to be changed.

const char *lu

An array of length cnt containing characters that represent whether the corresponding entry in the array bd specifies the lower or upper bound on column indices[j].

lu[j] 
= 'U'  
bd[j] is an upper bound 
lu[j] 
= 'L' 
bd[j] is a lower bound 
lu[j] 
= 'B' 
bd[j] is the lower and upper bound 

const double *bd

An array of length cnt containing the new values of the upper or lower bounds of the variables present in indices.

Example 

  status = CPXchgbds (env, lp, cnt, indices, lu, bd);

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