storing and appending in a for loop

Hi !

I want to store and append tables data in a for loop. below is the part of code.

using the k as a counter, it stores start and fin values in a vector. but I don't know how to store rng values and tables (and append tables in each loop)

When I am using rng(k) = .... I get this error :

"Unable to perform assignment because the size of the left side is 1-by-1316 and the size of the right side is 1-by-1253 "

and when I use rng and T (as below), it overwrites the data within each loop.

Can someone please help?

% vec,Rep,Pos = some data

k = 1
for i = 1:length(vec)
    time = (data(vec(i+1)));    
    
    if time >= 6          
       start(k) = vec(i);
       fin(k) = vec(i)+1;
       %Question part       
       rng = start(k):fin(k);
       T = table(data.Rep(rng),data.Pos(rng))
       
       k = k+1;
    end

end

Answer 1

[KSSV]

% vec,Rep,Pos = some data
X = cell([],1) ; Y = cell([],1) ; 
k = 1
for i = 1:length(vec)
    time = (data(vec(i+1)));    
    
    if time >= 6          
       start(k) = vec(i);
       fin(k) = vec(i)+1;
       %Question part       
       rng = start(k):fin(k);
       % T = table(data.Rep(rng),data.Pos(rng))
       X{k} = data.Rep(rng) ; 
       Y{k} = data.Pos(rng) ; 
       k = k+1;
    end

end
X = cell2mat(X) ; 
Y = cell2mat(Y) ; 
T = table(X,Y) ; 

[Mahla Bakhshi]

Thank you so much!

But since some other arithmetic operations,comparisons,etc (for X{k} Y{k} values within the inner loop ) is required, is there any other way than cell format?

[KSSV]

rng = start(k):fin(k);

The above line may have different number of indices, so to store them every time we have to use a cell. If they have same number of indices you can replace them with a marix. You need not to worry about your arithmetic operations, you can carry them as usual. You need to use flower braces {} for acessing cells. Read about them.