manually label data from a variable while looping through and save the labelled data in a new variable

I have some data stored in each row of a variable (example: 190x1800 i.e. 190 samples, each row is a sample). I am stepping through and plotting each sample with code below. I need to save some selected samples and the row no. into two different variables (rw_number & good_samples) upon reviewing the plot (i.e store only good data). How can i do this?

figure
for i=1:8:numSamples
    for j=0:1:7
        plot(time_scale, Ldata(i+j,:)
        axis([0 60 -1 1])
        disp(i+j)
        pause
        %hold on
    end
end

Answer 1

[Mohith Kulkarni]

Hi, you would like to review each plot in the loop and store the good samples. To do this, you can use "pushbutton" style property of "uicontrol" function to store the row number in the figure data. Click on the "store" button in the figure to store the row number. Refer to the code below:

f = figure;
data.A = [];
guidata(f,data);
pb = uicontrol('Style','pushbutton','String','store'); %pushbutton
for i=1:8:numSamples
    for j=0:1:7
        plot(time_scale, Ldata(i+j,:));
        axis([0 60 -1 1])
        row = i+j;        
        pb.Callback = {@store,row}; %callback for pushbutton
        pause
    end
end
rw_number = guidata(f).A;           %retrieving data into a variable
good_samples = Ldata(rw_number,:);  %accessing the samples
close(gcf);                         %close the current figure

function store(hObject,eventData,row)
    data = guidata(hObject); %retrieving the data struct from figure
    data.A= [data.A,row];   %updating row number
    guidata(hObject,data);  %updating the figure. 
end

[HT]

Thanks @Mohit or your answer. I tried it but getting erros and no data is being saved in data.A or good_samples. Following is the error:

Error: Functions cannot be indexed using {} or . indexing.

Error in Overlay_Traces (line 62)

rw_number = guidata(f).A; %retrieving data into a variable

[Mohith Kulkarni]

The direct indexing is possible in later releases. Try the following instead:

rw_number = guidata(f); %first retrieve the struct
rw_number = rw_number.A; %then index into the field

[HT]

Yes I had tried this and it worked. Thanks!