Drop a column from a matrix if one number in that column is less than 30

Hi everyone:

I'm new to matlab. As the title describes, I am trying to drop all columns in a matrix which contain a number less than 30. I am now using a loop to do so, but as the matrix grow bigger it become very slow, so I wonder if there's a more efficient way of coding to achieve the same effect. Below is my current code.

for i = 1:npaths
    if sum(bigMatrix(:,i)<30)>0
        bigMatrix(:,i)=[];
    end
end

Many thanks!

Answer 1

[dpb]

VAL=30;                                         % don't bury "magic numbers" in code; use variables
bigMatrix=bigMatrix(:,all(bigMatrix>=VAL));     % use MATLAB logical addressing/indexing

[Xiaoyu Ma]

This solved my problem perfectly! Thans a lot.