How I can find the index when both signals are high?

I have two signals. I want to find out indexes on which both signals are high. Both signals have the amplitude (0 & 1). Blue signal is shifted at y=1. Please help me. Thanks

Answer 1

[Bruno Luong]

Assuming your signal are binary vectors of the same size b and r

both = min(b,r);
d = diff([0; both(:); 0]);
upidx = find(d==1)          % index where both become high, a & c
downidx = find(d==-1)       % index where any of b/r becomes low (so both is no longer high), b & d

lgt = downidx-upidx         % (b-a) and (d-c)

[Tehreem Syed]

Thanks, this worked for me.

[Tehreem Syed]

Hi Bruno Luong, Sorry for asking you again. Can you please also tell me how we can find the index when one signal is high and one signal is low. I am also interested in finding time between c and b in the below figure.

[Bruno Luong]

OK, question first:

b=[0 1 1 1 0 1 1 1 0 0 1 0 0 0 1 0]
r=[0 0 0 0 1 0 1 0 0 1 0 1 1 1 1 1]

Align index with b and r signals

>> [1:16; b; r]

ans =

     1     2     3     4     5     6     7     8     9    10    11    12    13    14    15    16
     0     1     1     1     0     1     1     1     0     0     1     0     0     0     1     0
     0     0     0     0     1     0     1     0     0     1     0     1     1     1     1     1

What do you expect to get back that corresponds to "one signal is high and one signal is low"?

[Tehreem Syed]

I need the time in which one signal is high and other is low. For example b is high between 2 and4 whereas r is low between 2 and 4. I need the difference like (4-2) in which b was high and r was low.

[Bruno Luong]

I need you to provide the complete list the indexes you expected to get from the above example. You need to confirm me if all of the twelve below must be returned or only part of it. And I need them listed correctly

2 3 4 5 6 8 10 11 12 13 14 16

I don't need a explanation that is not perfectly clear. I can manage with the example if you can provide the list with some logic. I'll find the logic myself.

[Tehreem Syed]

Let me explain in detail.

I have 2 signals.

t = [1 2 3 4 5 6 7 8 9 10 11 12

A = [0 0 0 1 1 1 0 0 0 1 1 1]

B= [1 1 1 0 0 0 1 1 1 0 0 0]

From above signals we can see

A is zero between [1 to 3, 7-9] and A is one between [4-6, 10-12]

Like wise B is one between [1 to 3, 7-9] and B is zero between [4-6, 10-12]

Now I want vector C which will be the difference for the time when one signal is high and other signal is low.

C = 3-1, as in this interval one signal is high and other is low.

I need C like [3-1, 6-4, 9-7,12-10]

[Bruno Luong]

Sorry I give up. Your example is not generic for me, it's even totally trivial as both signal are exactly out of phase to each other. Your "explanation" is then not useful for me.

[Tehreem Syed]

Ok Thanks.