Menu pop up will not display plot

Hello, my code will display the plot for the first option: 'Thrust SSC', however when the option: 'North American X-15' is selected the plot will not display. Why is this? (nums, txt etc are data-sets)

My code:

choice = menu('Where are you travelling from?','Mercury','Venus','Earth','Mars','Jupiter','Saturn','Uranus','Neptune'); if choice == 1; choice = menu('Where are you travelling to?', 'Venus', 'Earth', 'Mars', 'Jupiter','Saturn','Uranus','Neptune'); if choice == 1; choice = menu('How are you travelling?', 'Thrust SSC', 'North American X-15', 'Walking', 'Space Shuttle','Millenium Falcon','None of the above'); if choice ==1; [nums1, txt1] = xlsread('Planet Distance.xlsx','Distance'); [nums2, txt2] = xlsread('Planet Distance.xlsx','Velocity'); menu_title = sprintf('You are travelling from %s to %s, this journey is %d Km or %d Miles. You have chosen to travel by %s, which travels at %4d Km/h or %3d mph. You will arrive at your destination in %s hours', txt1{2,1}, txt1{2,2}, nums1(1,2), nums1(1,3),txt2{2,1}, nums2(1,1), nums2(1,2),nums1(1,2)/nums2(1,2) ); menu(menu_title,'Plot Distance v Time graph'); if choice ==1; X = [0 nums1(1,2)]; % my dependent vector of interest t = [0 nums1(1,2)/nums2(1,2)]; % my independent vector figure % create new figure plot(t, X) end;

            elseif choice ==2;
            [nums1, txt1] = xlsread('Planet Distance.xlsx','Distance');
            [nums2, txt2] = xlsread('Planet Distance.xlsx','Velocity');
            menu_title = sprintf('You are travelling from %s to %s, this journey is %d Km or %d Miles. You have chosen to travel by %s, which travels at %4d Km/h or %3d mph. You will arrive at your destination in %s hours', txt1{2,1}, txt1{2,2}, nums1(1,2), nums1(1,3),txt2{3,1}, nums2(2,1), nums2(2,2),nums1(1,2)/nums2(2,2) );
            menu(menu_title,'Plot Distance v Time graph');
                if choice ==1;
                X = [0 nums1(1,2)]; % my dependent vector of interest
                t = [0 nums1(1,2)/nums2(2,2)]; % my independent vector
                figure % create new figure
                plot(t, X)
                end;
            end;
        end;
    end;

[Jan]

Do you notice that your code is not readable? Use the "{} Code" button to fix this.

Answer 1

[Jan]

This is the perfect case for the debugger. Set a breakpoint in the first line, start the code and step through it line by line. Using the debugger is much more efficient than asking the forum ;-)

I guess boldly, that you forgot to catch the output of the menu command:

menu(menu_title,'Plot Distance v Time graph');

==>

choice2 = menu(menu_title,'Plot Distance v Time graph');
if choice2 == 1

[Joe Nichols]

Cheers Jan Simon ;-)