How to create conditions according to the digital signal ?

Question

Awais Saeed 2018-11-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/429186-how-to-create-conditions-according-to-the-digital-signal

评论： Walter Roberson 2018-11-11

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

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Answer 1

Walter Roberson 2018-11-11

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/429186-how-to-create-conditions-according-to-the-digital-signal#answer_346315

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

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Awais Saeed 2018-11-11

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

Walter Roberson 2018-11-11

在 MATLAB Online 中打开

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