get_dofs_from_sim_data_for_sensitivity_extension.m

function U_ext = get_dofs_from_sim_data_for_sensitivity_extension(sim_data,der_indx)
%function U_ext = get_dofs_from_sim_data_for_sensitivity_extension(sim_data,detailed_data)
%
% function returns the solution which is used for PCA extension of the
% reduced basis.
%
% required fields of detailed_data:
%   RB_info.trained_with_derivative: last entry indicates which derivative
%   solution should be used.
%
% Markus Dihlmann 03.02.2011
%

if (nargin==1)||(der_indx == 0)
    % use original solution
    U_ext = sim_data.U;
else
    der_indx = der_indx;
    U_ext = sim_data.U_der{der_indx};
end