MATLAB: Find position of when 0 goes to 1

findlogical?position;

I am trying to determine when a signal is turning on and off. I have 5 signals. I have a nx5 logical of zeros and ones and I want to know when (i.e. position/row number) the signal is on (i.e. when signal=1). I can do this easily to find the first instance but I can't seem to find a function/conditional statement to find the second, third instances, etc.

Best Answer

help strfind

It works with numbers too.

X= rand(1,10)> 0.5
X =
  1×10 logical array
   0   0   0   0   1   1   0   1   0   0
strfind(X,[0 1])
ans =
     4     7

Related Solutions

MATLAB: Hi, i want to find in a binary random matrice position of columns full of zeros (a column of zeros)..

You can use all and find to locate columns containing only zeros:

>> X = randi(2,3,23)-1
X =
   0   0   0   0   1   1   1   0   1   1   0   0   1   1   1   1   1   1   1   1   1   0   0
   1   0   0   0   0   0   1   0   1   1   0   0   0   1   1   0   0   1   0   0   1   0   0
   0   1   0   1   0   0   1   1   1   1   0   0   0   0   1   1   0   1   0   1   1   1   0
>> find(all(X==0,1))
ans =
    3   11   12   23

MATLAB: If I have a logical array with 2 or more sets of continuous true values, how to just grab the first or second continual set, for example

v   = [0 0 0 1 1 1 1 0 0 0 1 1 0 0];
ini = strfind(v, [0, 1]);
fin = strfind(v, [1, 0]);
idx = (ini(1) + 1):fin(1)

Or perhaps:

ini = find(v, 1);
fin = strfind(v, [1, 0]);
idx = ini:fin(1)

Best Answer

Related Solutions

MATLAB: Hi, i want to find in a binary random matrice position of columns full of zeros (a column of zeros)..

MATLAB: If I have a logical array with 2 or more sets of continuous true values, how to just grab the first or second continual set, for example

Related Question