MATLAB: Could anyone help me to solve the issue in the following code

reshape

code:
unused_rows=1:12
while ~isempty(unused_rows)
rows_matrix=reshape(unused_rows,[],2)
rows_matrix(:,end)=rows_matrix(end:-1:1,end)
for k=1:size(rows_matrix,1)
    rows=rows_matrix(k,:)
    unused_rows=[];
end
end
The above code executes and gives me the result.
with respect to the command line 
rows_matrix=reshape(unused_rows,[],2)
I am getting the result to be
rows_matrix =
     1     7
     2     8
     3     9
     4    10
     5    11
     6    12
But I want to display the result in the following manner.
rows_matrix =
     1     9
     2     8
     3     7
     4    12
     5    11
     6    10
Could anyone please help me on this.

Best Answer

May not be the best way but it works:
rows_matrix=reshape(unused_rows,[],2)
rows_matrix=[rows_matrix(:,1) [sort(rows_matrix(1:3,2),'descend');sort(rows_matrix(4:6,2),'descend')]]
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