Help with adding a column with numbers that are repeated to a matrix

Hi,

I have a 2170x1 matrix I need to create a new 2170x2 matric where I add numbers going from 1 to 12 in the second column all the way to row 2170. The thing is that when 12 is reached I need it to start at 1 again and so on until the end of my matrix is reached but I can't figure out how to do that.

Answer 1

[Adam Danz]

If 'm' is your 2170x1 matrix,

pattern = [1:12]'; 
patternRep = repmat(pattern, ceil(size(m,1) / length(pattern)), 1);
m(:,2) = patternRep(1:size(m,1)); 

Answer 2

[Matt J]

Let's say your matrix is A,

A(:,2)=mod(0:2169,12)+1;