Question

In the for loop, you only can keep the last result from the for loop. I want to save the data each time I finish from the for loop. I can’t put the index of the for loop because not all variables are satisfying the if statement: my code is:

c=[1 3 2 3 3];p=[0 0 1 2 1];level2=[1 3];
for j=1:length(level2)
    for i=1:length(p)
        a=[p(i),c(i)]';
        if a(1,:)==level2(j)
            level3=a(2)
        else
        end
    end
end

So, how can I make level3 as a vector for all results from the for loop? Note that p,c and level2 should be dynamic values, but here they are static to make the example much easier.

Answer 1

You can try following

c=[1 3 2 3 3];p=[0 0 1 2 1];level2=[1 3];
level3=[];
for j=1:length(level2)
    for i=1:length(p)
        a=[p(i),c(i)]';
        if a(1,:)==level2(j)
            level3=[level3, a(2)];
        else
        end
    end
end

E.g., you will append result of iteration into the end of current vector.