I need help with grade calculator! thank you!!

Afternoon Matlab Users,

Hope you're all having the best of days!

This is part of my class homework - I'm trying to make a grade calculator.

where there's a 'Edit Text' user input where 'Number' grade is calculated when pressed the assigned 'Push button'

and another 'Edit Text' where I want display the 'Letter' grade in accordance to the number grade above also via 'Push Button'

Below is my coding:

% --- Executes on button press in enter11.
function enter11_Callback(hObject, eventdata, handles)
if (handles.out19 >70 && <=100)
 disp('You achieved a 1st');
elseif (handles.out19 >60 && <=69)
 disp('You achieved 2:1');
elseif(handles.out19 >50 && <=59)
 disp('You achieved 2:2');
elseif(handles.out19 >40 && <=49)
 disp('You achieved 3rd');
elseif(handles.out19 >0 && <=39)
 display('You failed');
end 

and below is the defined error:

Error while evaluating UIControl Callback.

Relating to this, I also want to display the 'Letter grade' on a Panel.

But i'm struggling!

Help would be appreicated.

[Adam Danz]

Copied here in case the question is edited/deleted as in a previous thead by OP.

----------------------------------------------------------------------------------------------------------

Afternoon Matlab Users,

Hope you're all having the best of days!

This is part of my class homework - I'm trying to make a grade calculator.

where there's a 'Edit Text' user input where 'Number' grade is calculated when pressed the assigned 'Push button'

and another 'Edit Text' where I want display the 'Letter' grade in accordance to the number grade above also via 'Push Button'

Below is my coding:

% --- Executes on button press in enter11.
function enter11_Callback(hObject, eventdata, handles)
if (handles.out19 >70 && <=100)
 disp('You achieved a 1st');
elseif (handles.out19 >60 && <=69)
 disp('You achieved 2:1');
elseif(handles.out19 >50 && <=59)
 disp('You achieved 2:2');
elseif(handles.out19 >40 && <=49)
 disp('You achieved 3rd');
elseif(handles.out19 >0 && <=39)
 display('You failed');
end 

and below is the defined error:

Error while evaluating UIControl Callback.

Relating to this, I also want to display the 'Letter grade' on a Panel.

But i'm struggling!

Help would be appreicated.

Answer 1

[Geoff Hayes]

bushra - it isn't clear what handles.out19 is or how it is set, one problem is with

if (handles.out19 >70 && <=100)

and all the other conditions. Note that the condition should be written as

if (handles.out19 >70 && handles.out19 <=100)

and this will be true for all other conditions as well. If handles.out19 is a text control, then you will need to convert that value from a string to a number.

[Miss B]

Hey,

Thank you for your fast reply!

Much appreciated!

Sorry let me further clarify my answer with this:

function enter7_Callback(hObject, eventdata, handles)

bb = str2double(get(handles.in5,'string'));

cc = str2double(get(handles.in6,'string'));

dd = str2double(get(handles.in7,'string'));

ee = str2double(get(handles.in8,'string'));

ff = str2double(get(handles.in9,'string'));

gg = str2double(get(handles.in10,'string'));

hh = str2double(get(handles.in11,'string'));

ii = str2double(get(handles.in12,'string'));

jj = (bb+cc+dd+ee)/4*0.2 + (ff+gg+hh+ii)/4*0.8

set (handles.out19,'string',num2str(jj));

That is the coding for the above handles.out19

Using the Output (Numerical grade) of handles.out19

I wanted to do display the Letter grade in a text control as well using if, elseif function

so whatever value is displayed on handles.out19 it would at the same display the letter grade in another text control using a button.

[Geoff Hayes]

Since handles.out19 is a text control, then you would need to convert it to a number. Something like

function enter11_Callback(hObject, eventdata, handles)
out19AsNumber = str2double(get(handles.out19, 'String'));
if out19AsNumber >70 && out19AsNumber <=100
    disp('You achieved a 1st');
elseif out19AsNumber >60 && out19AsNumber <=69
    disp('You achieved 2:1');
elseif out19AsNumber >50 && out19AsNumber <=59
    disp('You achieved 2:2');
elseif out19AsNumber >40 && out19AsNumber <=49
    disp('You achieved 3rd');
elseif out19AsNumber >0 && out19AsNumber <=39
    display('You failed');
end 

[Miss B]

Hi again,

im so sorry for being this annoying :(

The code worked thankfully, but the only problem is...as shown on the above image - i want it to show on the 'Predicted Grade' text control rather than the command window.

Would I put the following command set(handles.in20,'string','');

Thank you.

I hope i can help you the same way you offered to help me.

[Geoff Hayes]

Yes, the display calls will write the output to the command window. I thought that maybe these calls were just for debug purposes. If there is a specifc text control that you want to write to, then you need to do something similar to

set(handles.XYZ, 'String', strMessage);

where XYZ is the handle of the text control that you want to write to, and strMessage is the message that you want to display.

function enter11_Callback(hObject, eventdata, handles)
out19AsNumber = str2double(get(handles.out19, 'String'));
strMessage = '';
if out19AsNumber >70 && out19AsNumber <=100
    strMessage = 'You achieved a 1st';
elseif out19AsNumber >60 && out19AsNumber <=69
    strMessage = 'You achieved 2:1';
elseif out19AsNumber >50 && out19AsNumber <=59
    strMessage = 'You achieved 2:2';
elseif out19AsNumber >40 && out19AsNumber <=49
    strMessage = 'You achieved 3rd';
elseif out19AsNumber >0 && out19AsNumber <=39
    strMessage = 'You failed';
end 
set(handles.XYZ, 'String', strMessage);