Using a menu to generate variables for larger code

Hi all! New user. I have a large number of input variables that I need to generate a GUI plot. I am trying to use a menu for the user interface to avoid cluttering the GUI with lots of choices. I would also like to populate the menu with default values. Here is my code:

choice = menu('Choose Car Parameters', 'Vehicle', 'Initial Conditions');

if choice == 1

prompt = {'Car Max Speed: Min 10, Max 90',...
    'Drag Coefficient', 'Width (m)', 'Mass (Kg)',...
    'Acceleration Duration (s)'};
dlg_title = 'Input Car Parameters';
num_lines = 1;
def = {'40','0.5','1.5','1500','4'};
answer = inputdlg(prompt, dlg_title, num_lines, def);

else
    prompt = {'East Position (m)', 'West Position (m)',...
    'Initial Velocity (m/s)',};
dlg_title = 'Input Initial Conditions';
num_lines = 1;
def = {'0','0','3'};
answer = inputdlg(prompt, dlg_title, num_lines, def);
end

All of the outputs are numbers, but they are returned in an array matrix. When I open up the matrix, no values are present. How would I use the menu choices to output, say, a velocity i.e.

V = 'initial velocity' + a * 'Acceleration Dureation(s)'

Thanks very much!

Answer 1

[Stephen23]

For the 1st dialog box:

V = str2double(answer);
maxvel = V(1);
dragco = V(2);
width  = V(3);
mass   = V(4);
accdur = V(5);

For the 2nd dialog box:

V = str2double(answer);
eastpos = V(1);
westpos = V(2);
initvel = V(3);

[Luke Cabot]

@Stephen23 thanks very much for this, thats solved what I am trying to do for now