Code explanation, working with logical variables

Would you be so kind to clarify the following Matlab code:

I= (thresh-r)<0; 
IU=[~1;I(1:end-1) & ~I(2:end)];

?

where

thresh is the predetermined constant;

I don't understand what does the following line mean:

IU=[~1;I(1:end-1) & ~I(2:end)];

Answer 1

[Image Analyst]

It's ANDing a binary signal with the same binary signal shifted one over. In essence, it appears to produce a "true" where there are two or more values of "r" in a row that are above the threshold.