Error using vertcat Dimensions of matrices being concatenated are not consistent.

Good day. I am making a gui about the brayton cycle with input parameters. I am trying to display the previous parameters in a uitable but the error keeps popping out. This is the piece of code in my callback function.

Prev_val = [r_p,T_3c,n_comp * 100,n_turb * 100,n_th,W_net];
Prev_val = [Prev_val; get(handles.Prev_calc, 'data')];
set(handles.Prev_calc,'data',Prev_val);

When I run the program by commenting out line 2 first then bringing it back the error is not appearing.

Answer 1

[Matt J]

One way to trap the error is to insert code as follows

 Prev_val = [r_p,T_3c,n_comp * 100,n_turb * 100,n_th,W_net];

     columns1 = size(Prev_val , 2);
     columns2 = size( get(handles.Prev_calc, 'data') , 2   );

     if columns1~=columns2

       disp 'Unexpected size mismatch'

           columns1, columns2,

       keyboard

     end

Prev_val = [Prev_val; get(handles.Prev_calc, 'data')];

When you re-run, the code will stop at the point just before the error occurs, allowing you to inspect the sizes of the matrices you are trying to concatenate and analyze what led to them being that way. You can accomplish much the same thing by Setting Breakpoints.

[Michael John Paul Salazar]

I have tried inserting the code and the error still pops out and the table is still empty. I have tried the same idea by using

if size(Prev_val, 2)==size(get(handles.Prev_calc, 'data'), 2)

but still no luck

[Matt J]

The inserted code is not meant to prevent the error. It is meant to help you find out why it is occurring. Again, it will stop the code at the point where the error is occurring to let you inspect the state of the variables and analyze why they don't have the right size.

There is no path to a solution for this other than for you to determine why Prev_val and get(handles.Prev_calc, 'data') don't have the same number of columns.

[Michael John Paul Salazar]

Is there any way to preset the dimensions of get(handles.Prev_calc, 'data')?

[Matt J]

The dimensions of get(handles.Prev_calc, 'data') will be the dimensions of whatever variable you have placed in handles.Prev_calc.data.

[Michael John Paul Salazar]

So I tried this,

      data = get(handles.Calculations, 'Data');
    if size(data,2)==size(Out,2)

       data
       Out
       data = [data; Out];
    else 

    end
    set(handles.Calculations, 'Data', data);

and it displayed like this:

    data = 

        ''    ''    ''    ''    ''    ''
        ''    ''    ''    ''    ''    ''
        ''    ''    ''    ''    ''    ''
        ''    ''    ''    ''    ''    ''

    Out =

        8.0000  900.0000  100.0000  100.0000   44.7955  288.9921

    Error using vertcat
    Dimensions of matrices being concatenated are not consistent.

    Error in ME443_beta>Calculate_Callback (line 92)
       data = [data; Out];

    Error in gui_mainfcn (line 96)
            feval(varargin{:});

    Error in ME443_beta (line 42)
        gui_mainfcn(gui_State, varargin{:});

    Error in
    @(hObject,eventdata)ME443_beta('Calculate_Callback',hObject,eventdata,guidata(hObject))

    Error while evaluating uicontrol Callback

What condition did I miss?

[Matt J]

Well, it's very strange that you would get that particular error messagefrom vertcat.

But basically, the problem is that you are trying to join a numeric variable "Out" to the cell array of strings, "data". They both need to be cell arrays.

One possibility is to convert 'Out" to a cell array of strings as well,

   OutCell=textscan(num2str(Out),'%s');

   data = [data; OutCell{1}.'];

A different possibility is to split Out into cells, but keep the cell contents in numeric form,

   data = [data; num2cell(Out)];

Which one you need depends what you are going to do with the concatenated data later.

Answer 2

[KSSV]

[ones(2,1) ; ones(1,3)]

The above will throw a error, as dimensions are not compatible to join/concatenate. Where as the below

[ones(2,1) ; ones(3,1)]

works, as the dimensions of matrices are compatible to join. Check the dimensions of your matrices which you are joining.

[Michael John Paul Salazar]

I am really new to Matlab and I don't really know what to do. I have screened the actual gui and the callback code. Your guidance would be appreciated.

   % --- Executes on button press in Calc1.
function Calc1_Callback(hObject, eventdata, handles)
% hObject    handle to Calc1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
%Air Standard Brayton Cycle Program
%Setting initial parameters
T_1 = 293;
k = 1.4;
C_p = 1.0045;
%Input parameters
r_p = str2double(get(handles.Comp_ratio1,'String')); 
n_turb = (str2double(get(handles.Turb_eff1,'String')))/100; 
n_comp = (str2double(get(handles.Comp_eff1,'String')))/100; 
T_3c = str2double(get(handles.Max_Temp1,'String')); 

    %Calculation of missing variables
T_3 = T_3c + 273;
T_2s = T_1*(r_p^((k - 1)/k));
T_4 = T_3*(r_p^((1 - k)/k));
W_turbs = 1.0045*(T_3 - T_4);
W_comps = 1.0045*(T_2s - T_1);
W_comp  = W_comps/n_comp;
W_turb = W_turbs*n_turb;
W_net = W_turb - W_comp; %Calculate the actual net work
T_2 = (W_comp + 1.0045 * T_1)/C_p;
Q_in = 1.0045*(T_3 - T_2);
n_th = (W_net/Q_in) * 100; %Calculate the actual thermal efficiency
set(handles.Therm_eff1, 'String', n_th); %Display the output variables
set(handles.Net_Work1, 'String', W_net);
%%set(handles.Prev_calc,'data',[r_p,T_3c,n_comp * 100,n_turb * 100,n_th,W_net]);
%%Prev_val = get(handles.Prev_calc, 'data');
Prev_val = [r_p,T_3c,n_comp * 100,n_turb * 100,n_th,W_net];
%Prev_val = [Prev_val; get(handles.Prev_calc, 'data')]; - if i comment this out then bring this back again it works
set(handles.Prev_calc,'data',Prev_val);