MATLAB: XOR on rising edge of two arrays

Question

Hello,

I have two arrays containing 0's & 1's. I want to find xor of the two arrays with two additional conditions:

1. The xor has to be done only in the case of rising edges.
2. To distinguish which array is having rising edge first, I have assigned outputs as 3 levels i.e. 1, 0, -1

Considering an example, if 'a' and 'b' are input arrays and PWM3 is the output array;

a = [0,1,1,1,1,0,0,0,1,1,1,0,0,0,0,0,1]

b = [0,0,0,1,1,1,1,0,0,1,1,1,1,0,1,1,1]

So, the output has be ;

PWM3 = [0,1,1,0,0,0,0,0,1,0,0,0,0,0,-1,-1,0] , so if 'a' has rising edge first output is '1', if 'b' has rising edge first output is '-1', else the output is '0'.

I am trying as given below, but I can't figure out how to take into consideration rising edges only. If someone has any idea about it, please let me know.

Thanks

for p= 1:length(a)
if(a(p)== 1 && b(p)== 0)
PWM3(p) = 1;
elseif (a(p)== 0 && b(p)== 1)
PWM3(p) = -1;
else
PWM3(p) = 0;
end
end

Answer 1

a = [0,1,1,1,1,0,0,0,1,1,1,0,0,0,0,0,1];
b = [0,0,0,1,1,1,1,0,0,1,1,1,1,0,1,1,1];
a0 = [0; a(:)];
b0 = [0; b(:)];
i = find(diff(a0) | diff(b0));
js = find(~a0(i) & ~b0(i));
c = a(i)-b(i);
c = c(:);
i(end+1) = 0;
i = [i(js);  i(js+1)];
c = [c(js); -c(js)];
k = i > 0;
PWM3 = cumsum(accumarray(i(k), c(k), [length(a),1])).'