how to write xlswrite command in a loop such that after every loop, the row increments.

the program currently stores the values in a ".out" extension. need to store the output to an excel file also. how to add loop such that each calculated value of A gets stored in the next row.

        filename = 'testdata.xlsx';
A =  [tsince ro(1) ro(2) ro(3) vo(1) vo(2) vo(3)];                        
sheet = 1;
xlRange = 'A1';
 xlswrite(filename,A,sheet,xlRange);

[usama amjid]

i tried using

xlRange = 'A1:H10';

but it resulted in the last calculated value to be repeating in all rows from top to bottom.