A code is not working with editor window but works in command window for me

Hello. I made a GUI to read an image of size 320*240 and normalize it to range 0 - 1. Followed by it when the user clicks or selects a pixel of the normalized image, the pixel value is saved to a variable. This value is checked with a column matrix and when same value is found in it corresponding position (say ‘m’) is obtained. Then the value in array 2, in the same position (m) is displayed in a static text box.All this is done when the user clicks on a push button. The following code doesn’t work with editor window but works in command window. I tried using ‘set’ code line within and outside the loop. I don’t know what is the problem behind this, kindly help me. Thank you and Good day.

 rggb=0.5113;                                     % pixel value selected by user from normalized image
q=linspace(0,1,20001);                            % array 1
w=linspace(17,37,20001);                          % array 2
for m=1:20001                  % possible positions
if q(m)==rggb                  % Compare if ‘m’th value in array 1 matches with rggb
m;                    % corresponding ‘m’ where ‘rggb’ matches in array 1 
w(m);                    % corresponding ‘m’ value in array 2
set(handles.text1,’String’,num2str(w(m));         % display ‘m’th array 2 value as string in static text box
end                    % end for the if loop
end                    % end for the for loop