How to Plot a graph of Time versus Digital data?

I have a Microcontroller board(Arduino Uno) that sends data between 1 - 1024(digits)for every 1000 mili seconds to the COM port 5 of Windows XP PC.

I want to receive this data in to MatLab and display a graph of Time versus Data. I want to display both Static and Dynamic or whichever is possible easily.

Kindly, some one who is reading this, help me to write the code.**

I tried this code shown below, but I don't see anything on the graph.

    % Author :Sreeram Mohan
    %   Tested with arduino Duemilanove 
    %   Open source software for the arduino duemilanove !
    %   Feel free to use and suggest updates !!!!
    clear all;
    clc;
    s1 = serial('COM5');                            %define serial port
    s1.BaudRate=9600;                               %define baud rate

    %open serial port
    fopen(s1);
    clear data;
    for i= 1:100                                 %acquisition of 100 points
        data=fscanf(s1);%read sensor
        sine_data=str2double(data);
        y = 5*sin(2*3.14*2000*sine_data);
        subplot(1,2,1)
        stem(y,i);
        title('Values at each time interval');
        xlabel('number of points');
        ylabel('Sine Values for each point');
        drawnow;

        subplot(1,2,2)
        hold on;
        plot(sine_data,y,'--rs','LineWidth',2,...
                               'MarkerEdgeColor','k',...
                               'MarkerFaceColor','g',...
                               'MarkerSize',10)
        title('Sine Wave plotted from data obtained from arduino');
        xlabel('number of points');
        ylabel('Sine values ');
        drawnow;
    end
    % close the serial port!
    fclose(s1);

My question could be stupid. Forgive me for that.

Thank you, Suresh Jonna