Finding the difference between columns in matrix without loops

I have the results from an iterative process, where the results from each iteration is placed beside eachother, like this:

res = 
   43.7826   38.8460   38.6889   38.6912   38.6915
  107.0735   98.5577   98.1212   98.1170   98.1175
 -134.6218 -131.6938 -131.5378 -131.5352 -131.5352
 -105.9498 -103.1403 -102.9195 -102.9139 -102.9139

What I want to do is create one matrix that shows the difference between each column, and one matrix that shows the percentage change from one column to the next.

Edit: The first column of the first matrix will be:

diff(:,1) = res(:,2)-res(:,1);

Similar for the second matrix, but there I want the percentage change. This is obviously simple to do using loops, but is there a clever way to do this without loops (maybe using some built-in Matlab functions)?

Thanks.

[per isakson]

... difference between each column ... what exactly does that mean?

[John Doe]

The first column of the first matrix will be

diff(:,1) = res(:,2)-res(:,1);

Similar for the second matrix, but in that one I want the percentage change.

Answer 1

[Matt J]

 firstmatrix=diff(res,1,2);

 secondmatrix=100*bsxfun(@rdivide,firstmatrix,res(:,1:end-1));

[John Doe]

Thanks =)