MATLAB: Loading a variable from deferent .mat files selected using GUI matlab

Question

how can i load a double from a mat file that i selected using push button in gui matlab , whatever the matfile i be able to extract an load a double from it and use it ex: i have a mat file called 1.mat and another 2.mat

 whos -file 1.mat
  Name                   Size             Bytes  Class     Attributes
X1RPM                1x1                  8  double              
X1_BA_time      122136x1             977088  double              
X1_DE_time      122136x1             977088  double              
X1_FE_time      122136x1             977088  double

dt=new.X1_DE_time;

 2nd mat file 2.mat
 whos -file 2.mat
  Name                   Size             Bytes  Class     Attributes
X2RPM                1x1                  8  double              
X2_BA_time      122136x1             977088  double              
X2_DE_time      122136x1             977088  double              
X2_FE_time      122136x1             977088  double

dt=new.X2_DE_time;

using GUI now 1st push putton

function Data_Callback(~, ~, handles)
[filename, pathname] = uigetfile({'*.mat'},'File Selector');
set(handles.text5,'String', filename)% showing full path name
handles.data=load([pathname, filename]);
data=filename;
setappdata(0,'data',data);

2nd push putton

function ok_Callback(hObject, eventdata, handles)
new=load(getappdata(0,'data'));

now i have the problem , how can i load de time whatever the mat file selected

dt=new.X1 or X2 or,...._DE_time;

Answer 1

>> new.X1_BA_time = 1:3;
>> new.X1_DE_time = 4:6;
>> new.X1_FE_time = 7:9;
>> C = fieldnames(new);
>> X = cellfun('isempty',regexp(C,'^X\d+_DE_time$'));
>> dt = new.(C{~X})
dt =
   4   5   6