Switch Case when a value stagnates

Suppose I have a switch case scenario and a variable, var which records a value from a for-loop as such:

1st loop: var=10
2nd loop: var=9
3rd loop: var=9
4th loop: var=8
5th loop: var=8
6th loop: var=8
7th loop: var=8
8th loop: var=8
9th loop: var=8

When any value (in this case 8) is repeated for 3 times, I need to switch from case 1 to case 2. Now the question is, how can I check if a value is repeated 3 times?

In the case above, the first switch is performed when the value 8 is repeated 3 times (4th-6th iteration); and the second switch is performed the next series of value 8 is repeated for 3 times (7th-9th iteration).

Answer 1

[Ben11]

Here is a simple solution to detect the first occurence of values repeated 3 times; you could customize it to be more general.

clear all clc

A = [2 6 8 2 8 8 3 2 9 8 8 11 12 18 17 18 18 18 15 3];% Create a dummy vector
CheckSimilar = 0;

for i = 2:length(A)

     if A(i) == A(i-1)
      CheckSimilar = CheckSimilar +1;
     end

     if CheckSimilar == 3                
         fprintf('The value %i is repeated %i times',A(i),CheckSimilar);
      return
     end

end