How to apply uitable to compute and display values those two purposes at the same time?

I am a university student who recently study something related to computing and apply Matlab to solve some engineering problem. This time I am trying to using the GUI application which involve the uitable that I have never used before. I tried to made a GUI shown as below, all thing is going well and only one obstacle is the uitable. I had searched the stuff about the cell array and still no clue on using the uitable to display variable values or even the function will retrieve the data from the table to computate values for the next row.

I think there is 2 ways to solve the problem:

1) Keep the current function and hide the variables until the computation is ended then display all the values into uitable. Its seem to be easy to handle on the complexity. or

2) Modified the code and make function will retrieve the data from the table to computate values for the next row and repeat in loops during its operation. Its sound to be messy for me as a mechanical eng. student, not a student from computer engineering or a smart guy on mathematics.

Anyway, I still unable to know how to coding for input my data into the uitable. Can someone give me a hand on provie some clear, practical solutions or some inspiration for me to solving this problem? Thx.

Here is the code of the function currently using in this GUI:

(This is a bisection algorithm that will fprint the values on the command window.)

function run_button_Callback(hObject, ~, handles)

% hObject handle to run_button (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

func = get(handles.func_input, 'String');

xL = str2double(get(handles.xL_input, 'String'));

xU = str2double(get(handles.xU_input, 'String'));

Es = str2double(get(handles.Es_input, 'String'));

imax = str2double(get(handles.imax_input, 'String'));

%% Formatting Output:

fprintf(' ---------------------------------------------------------------------------------------------\n')

fprintf(' It. xL xR xU f(xL) f(xR) f(xU) |%% Err|\n\n');

%% Initial Conditions:

iter = 0;

xR_P = NaN; % The First Old Estimate Of Root Is Unknown.

%% Computation:

F_xL = feval(func, xL);

F_xU = feval(func, xU);

% Condition 01:

if (F_xL * F_xU > 0)

T01

else

while (1) % If (F_xL * F_xU < 0)

xR = (xL + xU) / 2;

F_xR = feval(func, xR);

% Compute Perc. Relative Appr. Error:

if (xR ~= 0)

Ea = abs((xR - xR_P) / xR) * 100;

end

% Output:

fprintf(' %3.0f %12.6f %12.6f %12.6f %11.6f %11.6f %11.6f %10.6f %%\n', iter, xL, xR, xU, F_xL, F_xR, F_xU, Ea);

fprintf(' >---\n\n')

% Condition 02:

Test = F_xL * F_xR;

if (Test < 0)

xU = xR;

F_xU = F_xR;

elseif (Test > 0)

xL = xR;

F_xL = F_xR;

else

Ea = 0;

end

% Increment Settings:

xR_P = xR; % Update The Old Estimate Of The Root

iter = iter + 1;

% Condition 03:

if (Ea < Es) %(Case: 1)

set(handles.status_output, 'String', 'Tolerance Is Satisfied.');

break

end

% Condition 04:

if (iter > imax) %(Case: 2)

set(handles.status_output, 'String', 'Iteration Limit Exceeded.');

break

end

end

fprintf(' ---------------------------------------------------------------------------------------------\n')

handles.xR_output.String = sprintf('%.6f', xR);

set(handles.iter_output, 'String', iter);

end

% Update handles structure

guidata(hObject, handles);

Note: T01 is a m.file which will popup a GUI window to show the error message if f(xl)*f(xu) > 0, it works properly.

Answer 1

[Peng Li]

Sorry didn't quite get your problem. are you trying to update the uitable as program is runing?

If it involves a loop in your callback, you could do something like

% show table
if app.ind_out == 1 % refresh, app.ind_out indexing your loop
    app.ResTable.Data = [];
end
app.ResTable.Data{app.ind_out, 1} = app.yourDataHandle;
app.ind_out = app.ind_out + 1;

[Peng Li]

app.ResTable is the handle of the uitable.

and similarly if you'd like to read stuff from the table, you can call app.uitablehandler.Data

[Marco Poon]

Thx for some advice. I'll try to understand about it.

Is that app.ind_out = app.ind_out + 1;

just similar with iter = iter + 1; ?

[Marco Poon]

My idea is that after i push the 'Run' buttom on the table input panel, the initial variables or data wil display on the first row of uitable.

Then the bisection alogrithm will use the data from the previous row to feval or compute and display the new values of such as xL...etc automatically in loops, and stop unitil the certain condition is reached.

And here is the flowchat or the mechanism diagram of my GUI program.

[Peng Li]

yeah that structure I provided should meet your need. and yeas the app.ind_out is the loop index. I'm showing the case that I have made it a class property because it might be used elsewhere. easier to share data.

[Marco Poon]

Recently, I have try to change my code from screen print table to the code for uitable. Yeah, It works. But the value shown is wrong.

Here is the code i have changed:

function run_button_Callback(hObject, eventdata, handles)

% hObject handle to run_button (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

func = get(handles.func_input, 'String');

f = str2func(func);

xL = str2double(get(handles.xL_input, 'String'));

xU = str2double(get(handles.xU_input, 'String'));

Es = str2double(get(handles.Es_input, 'String'));

imax = str2double(get(handles.imax_input, 'String'));

%% Initial Conditions:

iter = 0;

xR_P = 0; % The First Old Estimate Of Root Is Unknown.

%% Computation:

F_xL = f(xL);

F_xU = f(xU);

% Condition 01:

if (F_xL * F_xU > 0)

T01

else

xR = (xL + xU) / 2;

F_xR = f(xR);

i = 1;

Ea = 100;

while (1)

%save data

data(i, 1) = iter;

data(i, 2) = xL;

data(i, 3) = xR;

data(i, 4) = xU;

data(i, 5) = F_xL;

data(i, 6) = F_xR;

data(i, 7) = F_xU;

% Condition 02:

Test = F_xL * F_xR;

if (Test < 0)

xU = xR;

F_xU = F_xR;

elseif (Test > 0)

xL = xR;

F_xL = F_xR;

end

% Compute Perc. Relative Appr. Error:

if (i > 1)

Ea = abs((xR - xR_P) / xR) * 100;

end

data(i, 8) = Ea;

% Condition 03:

if (Ea < Es) %(Case: 1)

set(handles.status_output, 'String', 'Tolerance Is Satisfied.');

break;

end

% Condition 04:

if (iter > imax) %(Case: 2)

set(handles.status_output, 'String', 'Iteration Limit Exceeded.');

break;

end

% Increment Settings:

xR_P = xR; % Update The Old Estimate Of The Root

xR = (xL + xU) / 2;

iter = iter + 1;

i = i + 1;

end

end

set(handles.uitable1, 'Data', data);

handles.xR_output.String = sprintf('%.6f', xR);

set(handles.iter_output, 'String', iter);

Here is the new code output:

But the value is wrong in somewhere...

here is the screen print table: