Listdlg outputs numbers, how to get cell array back from user input

Hi! I have a project for school and here's one of the function files:

function [course_comp,course_reqd]=DB_A_Courses(daytonabeach)

%listdlg of classes for the one major offered

    course_list={'COM 122','COM 219 or 221',...
        'CS 120','HU 140','MA 111','PSY 101','AMS 115','AMS 116','AMS 117',...
        'AMS 118','AMS 261','AMS 262','AMS 263','AMS 264','AMS 271',...
        'AMS 272','AMS 273','AMS 274','AMS 365','AMS 366','AMS 375','AMS 376'};
    course_comp=listdlg('PromptString',...
        'Select each class completed.  When finished, press "Ok."',...
        'SelectionMode','Multiple','ListString',course_list,'Name',...
        'Aviation Maintenance Science');
%course_reqd=

**My question is if course_list=complete listing of classes and course_comp=classes user has completed, how can I get the courses the user has not completed yet and save it in a cell array of strings and then send it in nice format to a word or excel document?

Thanks for any help!

Answer 1

[Fangjun Jiang]

course_reqd=course_list(course_comp)