I am facing a problem in saving values from table to .mat file in app designer.

I have to trees with two-two nodes, and one table is linked to the tree. When I select the nodes first, it should show the values taken from a .mat file, in the table. I want to change some values of the nodes and save them in the same .mat file. It is saving different values to the nodes automatically, and sometimes I am getting an error "Dot indexing is not supported for variables of this type''. Below find the code of the app designer.

 properties (Access = private)
        tab
        Dx
        Dy
        Dz 
        IXX
        IYY
        IZZ  
    end
  % Callbacks that handle component events
    methods (Access = private)
        % Selection changed function: Tree
        function TreeSelectionChanged(app, event)
            selectedNodes = app.Tree.SelectedNodes; 
            app.tab  = load('property.mat');
            if strcmp(selectedNodes.Text,'Center of Mass')
                app.UITable.Data(1,1) = app.tab.dx(1);
                app.UITable.Data(2,1) = app.tab.dy(1);
                app.UITable.Data(3,1) = app.tab.dz(1);              
            end     
            if strcmp(selectedNodes.Text,'Inertia') 
                app.UITable.Data(1,1) = app.tab.Ixx(1);
                app.UITable.Data(2,1) = app.tab.Iyy(1);
                app.UITable.Data(3,1) = app.tab.Izz(1);        
            end            
        end
        % Selection changed function: Tree_2
        function Tree_2SelectionChanged(app, event) 
            selectedNodes2 = app.Tree_2.SelectedNodes; 
            app.tab  = load('property.mat');
            if strcmp(selectedNodes2.Text,'Center of Mass2')
                app.UITable.Data(1,1) = app.tab.dx(2);
                app.UITable.Data(2,1) = app.tab.dy(2);
                app.UITable.Data(3,1) = app.tab.dz(2);
       end
          if strcmp(selectedNodes2.Text,'Inertia2')
               app.UITable.Data(1,1) = app.tab.Ixx(2);
               app.UITable.Data(2,1) = app.tab.Iyy(2);
               app.UITable.Data(3,1) = app.tab.Izz(2);
            end
        end
        % Cell edit callback: UITable
        function UITableCellEdit(app, event)
            selectedNodes = app.Tree.SelectedNodes; 
            app.tab  = load('property.mat');
            if strcmp(selectedNodes.Text,'Center of Mass')
                 app.Dx = app.UITable.Data(1,1);
                 app.Dy = app.UITable.Data(2,1);
                 app.Dz = app.UITable.Data(3,1);

                 x1 = app.Dx;
                 y1 = app.Dy;
                 z1 = app.Dz;
                  
                 dx = [x1,app.tab.dx(2)];
                 dy = [y1,app.tab.dx(2)];
                 dz = [z1,app.tab.dx(2)];
                 
                 Ixx  = app.tab.Ixx;
                 Iyy  = app.tab.Iyy;
                 Izz  = app.tab.Izz;
                 
                 save('property.mat','dx','dy','dz','Ixx','Iyy','Izz');  
            end
 
            if strcmp(selectedNodes.Text,'Inertia')             
                 app.IXX = app.UITable.Data(1,1);
                 app.IYY = app.UITable.Data(2,1);
                 app.IZZ = app.UITable.Data(3,1);

                 dx = app.tab.dx;
                 dy = app.tab.dy;
                 dz = app.tab.dz;
                 
                 Ixx1  = app.IXX;
                 Iyy1  = app.IYY;
                 Izz1  = app.IZZ;
                 
                 Ixx  = [Ixx1,app.tab.Ixx(2)];
                 Iyy  = [Iyy1,app.tab.Iyy(2)];
                 Izz  = [Izz1,app.tab.Izz(2)];
                 
                 save('property.mat','dx','dy','dz','Ixx','Iyy','Izz');  
            end
            
             selectedNodes2 = app.Tree_2.SelectedNodes; 
             app.tab  = load('property.mat');
            if strcmp(selectedNodes2.Text,'Center of Mass2')
                 app.Dx = app.UITable.Data(1,1);
                 app.Dy = app.UITable.Data(2,1);
                 app.Dz = app.UITable.Data(3,1); 
                 x2 = app.Dx;
                 y2 = app.Dy;
                 z2 = app.Dz;
                 dx = [app.tab.dx(1),x2];
                 dy = [app.tab.dx(1),y2];
                 dz = [app.tab.dx(1),z2];
                 
                 Ixx  = app.tab.Ixx;
                 Iyy  = app.tab.Iyy;
                 Izz  = app.tab.Izz;
                 
                 save('property.mat','dx','dy','dz','Ixx','Iyy','Izz');  
            end
            if strcmp(selectedNodes2.Text,'Inertia2')
                 app.IXX = app.UITable.Data(1,1);
                 app.IYY = app.UITable.Data(2,1);
                 app.IZZ = app.UITable.Data(3,1);
                 dx = app.tab.dx;
                 dy = app.tab.dy;
                 dz = app.tab.dz;    
                 Ixx2  = app.IXX;
                 Iyy2  = app.IYY;
                 Izz2  = app.IZZ;
                 
                 Ixx  = [app.tab.Ixx(1),Ixx2];
                 Iyy  = [app.tab.Iyy(1),Iyy2];
                 Izz  = [app.tab.Izz(1),Izz2];
                 
                 save('property.mat','dx','dy','dz','Ixx','Iyy','Izz');  
            end
        end
    end

[Mario Malic]

Can you please format the code and write where the error is?

Thanks Walter.

[Saurabh Chaudhary]

Not getting errors everytime, but it is saving values inappropriately like when I change the value of any node, it is saving in different nodes also. I am attaching my mlapp here with the .mat file

[KALYAN ACHARJYA]

Sir, I am unable to test the code due to the new version you are using. Hopefully you will get the response from other members. You can formulate the question with small example. In the RHS is the table, which is the different than listbox, right?

app.name1ListBox.Items=string_list_form_excel;

[Saurabh Chaudhary]

Yes, i am not using excel. I am taking the values from a . mat file. it will open in lower version also.

Answer 1

[Mario Malic]

Error is in callback UITableCellEdit, because, these are two different nodes and in each tree, there is always one active. So, if you click on second tree and want to update CoM2, the app will also update the values you input to the table to the node that is active on first tree, therefore it's a flaw.

selectedNodes = app.Tree.SelectedNodes;
if strcmp(selectedNodes.Text,'Center of Mass')
if strcmp(selectedNodes.Text,'Inertia')

selectedNodes2 = app.Tree_2.SelectedNodes; 
if strcmp(selectedNodes2.Text,'Center of Mass2')
if strcmp(selectedNodes2.Text,'Inertia2')

You can create all four properties in the same tree, that would solve the issue.

Also, you can use a table with four rows and three columns (one for name of property and two for values for each model)

Also, you can use a structure, but it's a bit more complicated solution, better if you have many models that you want to calculate properties for

% This is just an idea, ideally you would have structure S.Model_1.dx, ...
S.Property = {'dx';'dy';'dz'; 'Ixx'; 'Iyy'; 'Izz'};
S.Model_1 = {4; 2; 3; 1; 2; 3;}
S.Model_2 = {1; 2; 4; 1; 4; 3;}
T = struct2table(S)
app.UITable2.Data = T

% You can create a callback that would update the values in fields and save structure

Regarding the last thread, callback won't be executed if the value did not change.