I have a problem with a plot

Hi everyone, i have a function that depends by a parameter. I plot this function and i save this plot with the command save. When i change the parameter, i want to show both functions in the same plot.. How can i do?

Answer 1

[Thorsten]

plot(x, y1);
hold on
plot(x, y2)

or

plot(x, y1, x, y2)

Answer 2

[Pawel Jastrzebski]

clear all;
clc;

x = 1:10;                                     % x values
parameter = [2 3 4];                          % number of parameters i.e 3

fig = figure                                  % create a figure windos
hold on;                                      % keep adding plots to the existing figure window

for i=1:length(parameter)                     % execute loop as many times as the number of the parameters

      y = x.^parameter(i);                      % calculate the function value for given parameter
      plot(x,y);                                % plot the function

      name = ['Figure-', num2str(i), '.png']; % create the name for the file

      % SET THE SIZE OF THE .PNG FILE
      set(fig,...
          'PaperPosition', [0 0 16 9],  ...
          'PaperUnits'   , 'centimeters'...
         );

      saveas(fig,name);                       % save the figure to a file

      % REPEAT ALL STEPS UNTIL THE END OF LOOP
  end