MATLAB: How to delete columns of a matrix that have fewer than 3 non-zero elements

Question

Hello,

How can I delete columns of a matrix that have fewer than 3 non-zero elements? Thank you!

Answer 1

Hi, I'm sure this isn't the most efficient way:

x =[
     5     0     1     4     1
     3     0     0     2     1
     1     0     2     2     4
     4     3     0     2     3
     4     2     0    1     3];
for nn =1:size(x,2) 
     numz(nn) = length(find(x(:,nn)==0)); 
 end
 x(:,numz>2) = [];