i want to code my program such that when i call the function with an input,it will create a first plot and then hold on that graph, and then as i run the program again for 2 more times it'll create similar graphs on the same first graph. Thesis work

n = input('Enter a number: ');

switch n

      case 10
          plot(Bulk_fluid_enthalpy,bulk_fluid_temperature)

          plot(Bulk_fluid_enthalpy,wall_temperature)
      case 30
          plot(Bulk_fluid_enthalpy,wall_temperature)
      case 50
          plot(Bulk_fluid_enthalpy,wall_temperature)
      otherwise
          disp('other value')
  end

hold all

plot(Bulk_fluid_enthalpy,bulk_fluid_temperature)

plot(Bulk_fluid_enthalpy,wall_temperature)