How to deal with Index exceeds the number of array elements ?

Hi all,

I have a signal like this (also attached).

I want to extract signal between first start and first end, second start and second end and so on. I am doing this like this:

 load 'signal'       
    start_location = [147,222,302,379,458,538,620,698,777];
    start_value = [-81.905,-87.408,-86.262,-85.463,-85.893,-84.910,-84.614,-83.543,-84.500]    
    end_location = [200,275,352,431,511,593,674,762];
    end_value = [-85.369,-85.028,-82.240,-80.933,-80.943,-80.082,-83.108,-85.543];
    
    plot(thigh_orient_y,'k')
    hold on
    plot(start_location,start_value,'ro')
    plot(end_location,end_value,'g*')
    h = legend('signal','start', 'end');
    
    %Settings
    a = start_location ;
    b = end_location;
    n = length(a);  
    
    %Extract data between red and green indices and put in cells
    T_or_y_cycle = cell(n,1) ;
   
    for i = 1:n
    T_or_y_cycle{i} = thigh_orient_y(a(i):b(i)) ;
    end

I am getting error

Index exceeds the number of array elements 

Beacuse there is larger number of 'start' than 'end', as the signal is cut at the end. Can you please help how to deal with this?

The n cannot be lenght(b) beacuse the signal can be cut at the begging and start with 'end' like here:

[Ankit]

How about choosing the size based on minimum value of n = min(length(a),length(b)) ?

[Tomaszzz]

Thanks, this does the trick, how can I accept you answer?

Answer 1

[Ankit]

 load 'signal'       
    start_location = [147,222,302,379,458,538,620,698,777];
    start_value = [-81.905,-87.408,-86.262,-85.463,-85.893,-84.910,-84.614,-83.543,-84.500]    
    end_location = [200,275,352,431,511,593,674,762];
    end_value = [-85.369,-85.028,-82.240,-80.933,-80.943,-80.082,-83.108,-85.543];
    
    plot(thigh_orient_y,'k')
    hold on
    plot(start_location,start_value,'ro')
    plot(end_location,end_value,'g*')
    h = legend('signal','start', 'end');
    
    %Settings
    a = start_location ;
    b = end_location;
    n = min(length(a),length(b));  % this will avoid extra start or end value.
    
    %Extract data between red and green indices and put in cells
    T_or_y_cycle = cell(n,1) ;
   
    for i = 1:n
    T_or_y_cycle{i} = thigh_orient_y(a(i):b(i)) ;
    end

Answer 2

[KSSV]

Your start_location is of size 1x9. Where as end_location is only 1x8. You need to put one more index in the variable end_location.