sortrows
Sort the rows of a real matrix.
(y,ind)=sortrows(a)
Inputs
a A real matrix.
y A real matrix of the same size as the input.
Outputs
ind A vector of the same size as the number of rows in the input.


Description
For sorting, the ordering of the rows is defined as follows: the row vector u is defined to be smaller than another row vector v of the same size if u[i]<v[i] for some i>1 and u[j]=v[j], j=1,..i . This ordering is same as the ordering used for comparision of strings.

The ind vector is such that the row i of the output is given by a(ind(i),:) .
Example
>>a=[ 4 4 5 5 6
>    2 2 4 7 8
>    2 2 3 1 5
>    4 4 4 2 9];
>>sortrows(a) 
          2          2          3          1          5
          2          2          4          7          8
          4          4          4          2          9
          4          4          5          5          6