After the model has been fully or partially built by calling functions from the NAG optimization modelling suite, e04tec may be used to set or modify a single element

c_{i}

in the (possibly sparse) linear objective function

c^{T} x

. This might be particularly helpful when the objective function needs to be extended after new variables have been added to the model by e04tac.

See Section 4.1 in the E04 Chapter Introduction for more details about the NAG optimization modelling suite.

4 References

None.

5 Arguments

1: $handle$ – void * Input: On entry: the handle to the problem. It needs to be initialized (e.g., by e04rac) and must not be changed between calls to the NAG optimization modelling suite.
2: $idxci$ – Integer Input: On entry: $i$ , the index of the element $c_{i}$ in the linear objective function.

Constraint: $1 \leq idxci \leq n$ , where $n$ is the total number of decision variables in the problem.
3: $ci$ – double Input: On entry: $c_{i}$ , the new value of the element in the linear objective function.
4: $fail$ – NagError * Input/Output: The NAG error argument (see Section 7 in the Introduction to the NAG Library CL Interface).

6 Error Indicators and Warnings

NE_ALLOC_FAIL: Dynamic memory allocation failed.
See Section 3.1.2 in the Introduction to the NAG Library CL Interface for further information.
NE_HANDLE: The supplied handle does not define a valid handle to the data structure for the NAG optimization modelling suite. It has not been properly initialized or it has been corrupted.
NE_INDICES: On entry, $idxci = ⟨ value ⟩$ and $n = ⟨ value ⟩$ .
Constraint: $1 \leq idxci \leq n$ .
NE_INTERNAL_ERROR: An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.
See Section 7.5 in the Introduction to the NAG Library CL Interface for further information.
NE_NO_LICENCE: Your licence key may have expired or may not have been installed correctly.
See Section 8 in the Introduction to the NAG Library CL Interface for further information.
NE_PHASE: The problem cannot be modified right now, the solver is running.
NE_SETUP_ERROR: The objective function is not linear.