How to create conditions according to the digital signal ?

If i have a digital signal and if first 2 bits are 10(i have designed the pulse to have 10 as first two bits), then xp and yp should be assigned a value. The code is matching only the first bit with the digital signal it is not matching the second bit.

clc
clear all 
close all
t=0:0.01:6;
fm=0.5;
pulse=(0.5).*square(2.*pi*fm.*t)+0.5;   
subplot(2,1,1)
plot(t,pulse)
L=length(t)
for i=1:L
      if pulse(i)==1  && pulse(i-1)==0 
         xp=0.402
         yp=0.597

   else if pulse(i)==1  && pulse(i-1)==1
           xp=0.435
           yp=0.290
   end
   end
end

Answer 1

[Walter Roberson]

You are checking backwards, looking at location i and then at the one before that.

Note you will have a problem when i is 1 as that could try to access location 1-1 = 0

[Awais Saeed]

by backwards you mean right to left of signal? how can i make the matching correct

[Walter Roberson]

t=0:0.01:6;
fm=0.5;
pulse=(0.5).*square(2.*pi*fm.*t)+0.5;   
subplot(2,1,1)
plot(t,pulse)
L=length(t)

     if pulse(1)==1  && pulse(2)==0 
           xp=0.402
           yp=0.597

     elseif pulse(1)==1  && pulse(2)==1
             xp=0.435
             yp=0.290
     else
       error('What did you intend xp and yp to be if the first bit is not 1?')
     end

Answer 2

[madhan ravi]

for i=2:L

[Awais Saeed]

Still not matching correctly.