function [matched_item_A,matched_item_B]=match_num_rows_by_addition(unmatched_item_A,unmatched_item_B)
rowsize_unmatched_item_A=size(unmatched_item_A,1);rowsize_unmatched_item_B=size(unmatched_item_B,1);
matched_item_A=[unmatched_item_A;repmat(nan,(rowsize_unmatched_item_B-rowsize_unmatched_item_A),size(unmatched_item_A,2))];
matched_item_B=[unmatched_item_B;repmat(nan,(rowsize_unmatched_item_A-rowsize_unmatched_item_B),size(unmatched_item_B,2))];   