how plot only show the value which I selected

I set up a menu for selection, but even I just select one of them the plot still showing all of them, how can I change it?

Location = menu('Please select a loaction',LocationID);
fprintf('On Day %d, at location %s, the ice thickness was %0.4f [m]\n',Days(day),LocationID(location),Ice(day,location));
plot(Days,Ice,'ro');
xlabel('Time(day)')
ylabel('Ice Thickness(m)')
grid on

Answer 1

[Walter Roberson]

Location = menu('Please select a loaction',LocationID);

assigns to a variable named Location with an upper-case L

fprintf('On Day %d, at location %s, the ice thickness was %0.4f [m]\n',Days(day),LocationID(location),Ice(day,location));

reads from a variable named location with a lower-case L.

MATLAB is case sensitive. You are not using the variable you think you are.