Isolate Elements in a Vector

Suppose I have two sets of data:

ab =

    0.3570
    0.3560
    0.3750
    0.5150
    0.3570
    0.3560
    0.3750
    0.5150

and

ab =

    0.4100
    0.2500
    0.3340
    0.5500
    0.6250
    0.7760
    0.3330
    0.4100
    0.2500
    0.3340
    0.5500
    0.6250
    0.7760
    0.3330
    0.4100
    0.2500
    0.3340
    0.5500
    0.6250
    0.7760
    0.3330
    0.4100
    0.2500
    0.3340
    0.5500
    0.6250
    0.7760
    0.3330
         0

As you see with the set ab, the numbers repeat itself:

    0.3570
    0.3560
    0.3750
    0.5150

and with second set ab:

 0.4100
    0.2500
    0.3340
    0.5500
    0.6250
    0.7760
    0.3330

But also note that there is a zero at the end of the second set.

Now if I wanted to construct a vector using one set of data, I would use the following command for the second set to remove that zero

reshape(ab(1:end-1), [], 4);

This would read the vector from the first element to the last, being 0 and remove it with end-1. This also assumes that there are 4 runs.

Obviously this wouldn't work for the first set.

What would I need to change for this to read both sets and to prompt the user how many runs of data there are?

[Azzi Abdelmalek]

What is the general case?

Answer 1

[Azzi Abdelmalek]

If you have just these two cases

if ab(end)==0
 ab(end)=[]
end
out=reshape(ab,4,[])

[T]

And to prompt for user input for a 4 or a 2 in a GUI?

[Azzi Abdelmalek]

I did'not understand

[T]

If I want to create a GUI with the guide feature within MATLAB, how can I construct the GUI to include user input by prompting the user to enter in the value, in this case four, and have that descend?

Assuming of course that I have already uploaded the data in file format.

[Azzi Abdelmalek]

In your gui, you can add an edit box where the user can introduce his value

[T]

Okay so my edit box code reads as follows:

% --- Executes during object creation, after setting all properties.
function runs_CreateFcn(hObject, eventdata, handles)
% hObject    handle to runs (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

am I supposed to create the call back function within property inspector? It will not show up in the .m file.

[Azzi Abdelmalek]

In your guide, right click on your edit box , then click on view callback. after that, a callback function will be created in your m fille

[T]

Ah. I just forgot to update the handles and recall it later for future use that's all.

[T]

Hi Azzi,

I strangely got the following error using the same data but saved in another directory:

Attempted to access ab(0); index must be a positive integer or
logical.

Error in test>runs_Callback (line 369)
 if ab(end)==0 %checks to see if the .mdb file contains a zero at
 the end,

Do you know how I can resolve this?

[Azzi Abdelmalek]

I guess because your ab becomes empty, to understand check this:

a=[];
if a(end)==0;
a(end)=[],
end

[T]

Actually it would appear that the file in another directory didn't have any data at all!

How could I prompt the user to notify of such an occurence?