How to obtain values that meet a condition and store them in another variable without overwriting

Hi Matlab comunity,

So I have a variable called ALPHA, which has a 4x3 size and contains the following values

ALPHA = [29.1153, 36.8323, 38.2052; 40.9845, 40.9845, 40.9845; 19.1654, 19.1654, 19.1654; 3.0297, 8.7400, 33.9362];

This variable was obtained by extracting elements from one field from one structure that sometimes has 2x1 matrices, 1x1, 3x1 and no more than 3 values. I don't really mind if some values are repeted in this variable (I don't know why, I guess because since Matrices cannot be uneven, Matlab filled out to have a equally distributed matrix). The thing is that I want to create another variable that either extracts the values that lies equal or larger than 8 and smaller or equal than 12. If there is no value, then I want "0" as a value. The result for this example would be a row vector:

CF= [0 ; 0; 0 ; 8.7400] ;

A plus would be that insted of repeted values I could replace those repeted with "0" in their respective column. For example, ALPHA(2,2) = 0 and ALPHA (2,3) = 0. I haven't tried this but this is my code so far and I only get errors:

ALPHA= transpose(ALPHA); %get a row vector

CF= []; % prealocate vector

int= 1; %counter

for NV= 1:length(ALPHA);

CF(int,: )= find(ALPHA(int, :) >=alpha_min & ALPHA(NV ,:)<=alpha_max);

CF(int,: ) = ALPHA(CF(int,:));

if isempty(CF(NV));

CF(int,:)= 0;

end

int= int+1; %updating counter

end

As a result, I only get either 0's , a row vector of 4 elements (all 8.7400) or my favorite message "Unable to perform assignment because the indices on the left side are not compatible with the size of the right side".

Could you take a look and let me know what is wrong? I hope I was clear with my explanation.