how can i avoid return to zero from my plot

Bitsnum = 11;
dataIn = randi([0 1],1,Bitsnum);
i = 1;
count = 0;
t = 0:.01:length(dataIn);
for j =1:length(t)
    if t(j) >= (0+count) && t(j) <= (0.5+count);
        if dataIn(i) == 1;
        manchester(j) = 2;
        elseif dataIn(i) == 0;
        manchester(j) = -2;
        end
        
    elseif t(j) > (.5+count) && t(j) <= (i);
        if dataIn(i) == 1;
        manchester(j) = -2;
        elseif dataIn(i) == 0;
        manchester(j) = 2;
        end  
    else
        i = i+1;
        count = count+1;
        
    end
end
subplot(3,2,5);
plot(t,manchester,'LineWidth',2,'color','red');
axis([0 length(dataIn) -3 3])
grid on;
title(['manchester: [' num2str(dataIn) ']']);

Answer 1

[Kodavati Mahendra]

Bitsnum = 11;
dataIn = randi([0 1],1,Bitsnum);
i = 1;
count = 0;
t = 0:.01:length(dataIn);
for j =1:length(t)
    if t(j) >= (0+count) && t(j) <= (0.5+count);
        if dataIn(i) == 1;
            manchester(j) = 2;
        elseif dataIn(i) == 0;
            manchester(j) = -2;
        end
        
    elseif t(j) > (0.5+count) && t(j) <= (i);
        if dataIn(i) == 1;
            manchester(j) = -2;
        elseif dataIn(i) == 0;
            manchester(j) = 2;
        end  
    else
        manchester(j)= manchester(j-1);
        i = i+1;
        count = count+1;
    end
end

% subplot(3,2,5);
plot(t,manchester,'LineWidth',2,'color','red');
axis([0 length(dataIn) -3 3])
grid on;
title(['manchester: [' num2str(dataIn) ']']);

I am not sure if i understand your question properly. Does this code solve your problem?

The problem is with your ifelse loop. for some j, manchester(j) is undefined. MATLAB assigned it a default value of 0. So I added one more line inside else. Does this work?

[Kodavati Mahendra]

for example, check the output of the following command to understand the problem with your code.

x(1) = 1;
x(10) = 1;
plot(x);

MATLAB doesn't know the values of x(2) to x(9). So it sets them to 0 and plots the graph. If you want them to be something different, you should declare them properly.

Maybe

x(1:10) = 1;plot(x);

[Mohamed Essam]

thank you very much