/// <summary>
/// Sets the variable at the given index.
/// </summary>
/// <param name="value">The variable to set at the index.</param>
/// <param name="index">The index of the variable.</param>
protected void SetVariableByIndex(Variable value, params object[] index)
{
_variables[index] = value;
}
/// <summary>
/// Creates a variable at the given index.
/// </summary>
/// <param name="lowerBound">The variable's lower bound.</param>
/// <param name="upperBound">The variable's upper bound.</param>
/// <param name="name">The variable's name.</param>
/// <param name="index">The index.</param>
public void Add(double lowerBound, double upperBound, string name, params object[] index)
{
this[index] = new Variable(_solver, _variableType, lowerBound, upperBound, name);
}