Need help calculating fixation lengths

Hello,

I am looking to calculate the lengths of fixations on different areas, but I am completely stuck on it. What I need is for my code to only take into account when there are more than three in a row of the same value. So I have the following code:

x = {'d','f','g'}; %areas of interest
r = {'d','d','d','d','d','d','f','f','f','f','g','g','f','f','d','d','d','d','g','g','g','g','f'};
[~,ii] = ismember(r(1:end),x) %Changes from strings to numbers (d=1,f=2,g=3)

I can register the occurrences of every change in area of interest, but I can't seem to get it to ignore the ones that are shorter than 3. So in the above example at: ...'f','g','g','f'... It should ignore the g's, possibly change those g's into zeroes.

Any ideas?

Answer 1

[Margreet]

This seems to accomplish what you ask. I don't know if it is the most elegant solution, though...

clc; clear all; close all;
x = {'d','f','g'}; %areas of interest
r = {'d','d','d','d','d','d','f','f','f','f','g','g','f','f','d','d','d','d','g','g','g','g','f'};
[~,ii] = ismember(r(1:end),x); %Changes from strings to numbers (d=1,f=2,g=3)

constantVar= r(1);
counter=1;
for i = 2:length(r)
    tempVariable = r(i);
    if (strcmp(tempVariable,constantVar) == 1)
        counter = counter+1;
    else
    if (counter <= 2)
      lowerLimit = i- counter;
      upperLimit = i-1;
      ii(lowerLimit:upperLimit) = 0;
    end
    counter=1;
    constantVar=r(i);
    end
end

if (counter <= 2)
   lowerLimit = length(r)- counter+1;
      upperLimit = length(r);
      ii(lowerLimit:upperLimit) = 0; 
end

[H]

That's perfect. Thanks a lot.