How to group a matrix based on height

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R MONTGOMERY
R MONTGOMERY on 17 Mar 2019
Answered: Akira Agata on 8 Apr 2019
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
  3 Comments
Image Analyst
Image Analyst on 17 Mar 2019
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
R MONTGOMERY on 17 Mar 2019
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

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Answers (1)

Akira Agata
Akira Agata on 8 Apr 2019
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

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