(There is an exception to that if you turn on the Vectorized option)
So, No, there is no way to arrange to have the function pass in a 2D array of values that you can then access rows or columns of.
You can, however, reshape() the vector you receive as the first thing you do.
Remember that constraints and bounds will be in terms of vectors of values. So if you wanted to create a lowerbound specification in terms of columns, the first column intended to correspond to a and so on, then you can go ahead and create the constraints in that form -- just remember to reshape() the constraint array to pass it in.
You may wish to consider using Problem Based Optimization, which allows you to build constraints and objectives in terms of operations on vectors and arrays, and internally it builds the appropriate functions and vectors necessary.
