save result in while loop

I have a this code

index_A=[];    
while (ibd <= max_it)
i=i+1;    
index_A =[tt;index_A]   
    
end

in i=1; index_A=[19;20].

in i=2; index_A=[14].

how I can save them all in index_A?

result should be=[19;20;14];

index_A(i) =[tt;index_A]   

the above code is not working

[madhan ravi]

what's tt and why do you need a loop?

[NA]

I have random variable in the loop

 tto=find(mes>5);  
 TT=[tto;TT];   

so TT is changing.

TT=[];
index_A=cell([],1);    
while (ibd <= max_it)
i=i+1;   
tto=find(mes>5);  
 TT=[tto;TT];  
index_A = find( some condition); 
index_A{i}= tt ;% save what you want ;    
end
index_A = cell2mat(index_A) ; 

Answer 1

[KSSV]

index_A=cell([],1);    
while (ibd <= max_it)
i=i+1;    
index_A{i}= t ;% save what you want ;    
end
index_A = cell2mat(index_A) ; 

[NA]

this code works for me

TT=[];
index_A=cell([],1);    
while (ibd <= max_it)
i=i+1;   
tto=find(mes>5);  
TT=[tto;TT];  
temp = find(some condition); 
temp=[TT;temp];
index_A{i}= temp ;% save what you want ;    
end
index_A = cell2mat(index_A) ;   

[KSSV]

index_A{i} =tt  ;

[KSSV]

We cannot help unless the whole code is shown.