Question

I have a 2 Year-Columns in Matlab as shown below:

             % Col2 Is always greater than Col1
mat  = [2009 2012 ;
        2012 2012 ;
        2012 2013 ;

I need to do 2009:2012 for row1, 2012:2012 for row2, and so on…. This is not very easy as the size 1:N keeps changing for each pair.

FinalAns = [    2009
                2010
                2011
                2012           % -- 
                2012           % -- 
                2012
                2013      ] ;  % -- 

I cannot use a ‘for’ loop as the data size is very large and I was not successful in using accumarray for this. A vectorized solution would be highly appreciated.

Answer 1

This does what you need:

n = size(mat, 1);
c = arrayfun(@(x) {mat(x, 1):mat(x, 2)}, 1:n);
FinalAns = [c{:}];