unable to plot a function graph

this is the question. s = p(1+i)^n, Write a program that will plot the amount S as it increases through the years from 1 to n. The main script will call a function to prompt the user for the number of years (and error-check to make sure that the user enters a positive integer). The script will then call a function that win plot S for years 1 through n. It will use 0.05 for the i and $10,000 for P. my code(main script)

x = input('Please enter the number of year to cal the lumpsumS : ');

      if(x > 0)

          mylumpsum(x);
      else
          disp('Please enter again,the # of year has to be positive !')

      end

sub script
function mylumpsum(x)
prinp = 10000;
itr = 0.05;
    for i = 1:x;
    y =  prinp*((1+itr)^(i));
    xaxis = 0 : 1 : x;
    plot(xaxis,y,'-r')
    xlabel('x-axis');
    ylabel('y-axis');
    title('The graph of lump sum S');
    end
   end

it was not working, can anyone identify the problems?

[Odien]

function mylumpsum(x)
prinp = 10000;
itr = 0.05;
    for i = 1:x;
    y =  prinp*((1+itr)^(i));
    xaxis = 0 : 1 : x;
    plot(xaxis,y,'-r')
    xlabel('x-axis');
    ylabel('y-axis');
    title('The graph of lump sum S');
    end

end

Answer 1

[Star Strider]

Some slight changes in part of your code to make it work:

prinp = 10000;
itr = 0.05;
for i = 1:x;
    y(i) =  prinp*((1+itr)^(i));                % Save ‘y’ In Every Step
end
xaxis = 0 : 1 : x-1;                            % Since ‘x’ Begins At ‘1’, ‘xaxis’ Has To Go To ‘x-1’ To Be The Same Length As ‘x’
plot(xaxis,y,'-r')                              % Put The Plot After The Loop
xlabel('x-axis');
ylabel('y-axis');
title('The graph of lump sum S');

[Odien]

its work! thank you for the correction!

[Star Strider]

My pleasure!

It’s all your code — I just rearranged it a bit.