ASK,FSK, and PSK coding for matlab?

MATLAB CODE:

%matlab code for digital modulation(ask, fsk and psk)

f=5;

f2=10;

x=[1 1 0 0 1 0 1 0] % input signal ;

nx=size(x,2);

i=1;

while i<nx+1

     t = i:0.001:i+1;

    if x(i)==1

       ask=sin(2*pi*f*t);

       fsk=sin(2*pi*f*t);

       psk=sin(2*pi*f*t);

    else

        ask=0;

        fsk=sin(2*pi*f2*t);

        psk=sin(2*pi*f*t+pi);

    end

    subplot(3,1,1);

    plot(t,ask);

    hold on;

    grid on;

    axis([1 10 -1 1]);

    title('Amplitude Shift Key')

    subplot(3,1,2);

    plot(t,fsk);

    hold on;

    grid on;

    axis([1 10 -1 1]);

    title('Frequency Shift Key')

    subplot(3,1,3);

    plot(t,psk);

    hold on;

    grid on;

    axis([1 10 -1 1]);

    title('Phase Shift Key')

    i=i+1;

end

 OUTPUT:

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