How to group a matrix based on height

EDIT __________

my apolgies for confusion

Say I have a matrix of nx1 as such:

[..... 2.59, 2.6, 2.6, 1.7 , ....... , 1.8 , 2.57 , 2.6, 2.7, 1.8.....]

(block 1) (block 2)

Is there a function that groups that first "block" of values over 2.5 as "block 1" and then the second "block" of values over 2.5 as another thing such as "block 2"

my apologies I appreciate your help

[Walter Roberson]

There are no locations in your sample data where the difference in heights between two columns exceeds 2.5 ("values above 2.5 above/below each other") ?

[Image Analyst]

We're not going to type that in. Please attach the data with the paperclip icon. Make it easy for people to help you, not hard.

[R MONTGOMERY]

Im sorry Im not very clear.

Let me ask this instead as my english skills are not so great.

Say I have a matrix of nx1 as such:

[..... 2.59, 2.6, 2.6, 1.9 , ....... , 1.9 , 2.57 , 2.6......]

Is there a function that groups that first "block" of values over 2.5 as "block 1" and then the second "block" of values over 2.5 as another thing such as "block 2"

my apologees I appreciate your help

Answer 1

[Akira Agata]

If you have Image Processing Toolbox, you can do this task easier by using bwlabel function. The following is a simple example.

nx1 = [1.1, 2.59, 2.6, 2.6, 1.7, 1.8, 2.57, 2.6, 2.7, 1.8];
idx = nx1 > 2.5;
group = bwlabel(idx);

The result is like:

>> group

group =

0 1 1 1 0 0 2 2 2 0