MATLAB: Do not take any amount

Question

pop=randi([100],20,8);
[r1,c1]=size(pop);
for i=1:r1
    A=randi(100);
    if A<=90
        pool(i,:)=pop(i,:);
    end
end

Hi

I want if the condition is not met, the pool variable does not take any value, in other words, in the end, for example, it becomes an 18×8 matrix, not an 20×8 matrix with 2 rows containing the value 0

Thank you for your guidance

Answer 1

pop=randi([100],20,8);
[r1,c1]=size(pop);
pool = zeros([],c1) ; 
count = 0 ; 
for i=1:r1
    A=randi(100);
    if A<=90
      count = count+1 ; 
        pool(count,:)=pop(i,:);
    end
end

You need not to use loop...it can be vectorized.

pop=randi([100],20,8);
[r1,c1]=size(pop); 
A = randi(100,1,r1) ; 
pool = pop(A<=90,:) ;