Question

I want to sort the rows according to their second entries, i.e. by second column. Each entry of the second column is an array chars(representing a time stamp). There also might be missing values, i.e. the entry in the second column can be []. How do I do this?

Answer 1

you need to use the sortrows() function
if the matrix you wanted to sort is A then use

sorted_matrix = sortrows(A,2);

http://www.mathworks.com/help/techdoc/ref/sortrows.html