EEG data, tried three different ways and end up with same subsindex error

I am writing a code that replaces values around an EEG data file where there is a 9, it changes the values (4 to the left and 7 to the right) to 5:16 for option 2 and for option 3, it would look for number 59 and replaces values around it from 58 to 63.

 function OUTEEG = FormatEEGarry(EEG,option)

 x= pop_loadset;

 optionChoose = inputdlg('What option do you want?:', 'Option input',[1,30])

 option = str2num(optionChoose{:});                                     %option chosen and stored

 search_9 = find([x.event.epochtype]==9);
 search_59 = find([x.event.epochtype]==59); 

 if option ==1

    for k=1:size(x.event,2)
        temp= x.event(k).epochtype
        if [x.event(k).epochtype] ~=1;
            x.event(k).epochtype =99;
        end
        disp([temp x.event(k).epochtype])
    end
end

 if option ==2

    for ii= 1:size(search_9);

        temp= x.event(ii).epochtype;
        if (search_9(ii)+7) <= size([x.event.epochtype],2) 
           if (search_9(ii)-4) >= 1
        ringa = search_9(ii) + [-4:7];
        [x.event(ringa).epochtype]= 5:16;
           end
        end
        disp([temp x.event(ii).epochtype])
    end
end

i keep getting an error for the line

   [x.event(ringa).epochtype]= 5:16;

and the error is Undefined function or variable 'ringa'.

Error using subsindex Function 'subsindex' is not defined for values of class 'struct'.

An alternative choice for option 2 that i used is as follows,

 if option ==2
    temp = x.event(ii).epochtype
    Z = +regexprep(char(x.event.epochtype),sprintf('.{0,4}%c.  {0,7}',9),char(5:16))
    disp([temp x.event(k).epochtype])
 end

This seems to do half the job and changes the data around 9 to 1 1 1 9 10 11 12 1 1 1. Which is not quite there yet.

I am not really sure what to do here??

[Stephen23]

Continuation of:

http://de.mathworks.com/matlabcentral/answers/232638-replacing-numbers-around-a-specific-index-can-t-figure-it-out

Answer 1

[Walter Roberson]

Time to use the debugger

dbstop if error

then run the code. When it stops with the error about ringa not being defined, verify that the line before is indeed

    ringa = search_9(ii) + [-4:7]

and make sure that the spelling of the variable is exactly the same. Point to the variable in the line before to see its value. Use "whos" to see which variables are in the workspace.

[Sanwal Yousaf]

Apologies for trying this so late. I just tried this and this is what i got. I changed the name of ringa to change_data;

 K>>  change_data = search_9(ii) + [-4:7]

change_data =

    13    14    15    16    17    18    19    20    21    22    23    24
and

K>> whos Name Size Bytes Class Attributes

change_data       1x12                  96  double              
ii                1x1                    8  double              
option            1x1                    8  double              
optionChoose      1x1                  114  cell                
search_59         1x22                 176  double              
search_9          1x22                 176  double              
temp              1x1                    8  double              
x                 1x1             40278920  struct

[Sanwal Yousaf]

Thank you dear sir