Generation of FSK signal using MATLAB!!!

Code for generating FSK signal using MATLAB!

x=input('input binary message sequence');
N=length(x);
t=0.001:0.001:N;
for i=1:1:N;
   m((i-1)*1000+1:i*1000)=x(i);
end
f1=10;
f2=5;
c1=2*sin(2*pi*f1*t);
 y1=m.*c1;
 for j=1:N
     if x(j)==1
         x(j)=0;
     else
         x(j)=1;
     end
     m1((j-1)*1000+1:j*1000)=x(j);
 end
 c2=2*sin(2*pi*f2*t);
 y2=m1.*c2;
 y=y1+y2;
 subplot(3,1,1);
 plot(t,m);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Bit sequence');
 subplot(3,1,2);
 plot(t,c1);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Carrier');
 subplot(3,1,3);
 plot(t,y);
 xlabel('Time');
 ylabel('Amplitude');
 Title('Fsk signal');
Output:
 Input sequence [1 0 0 1 1 1 0]