a=[1,2,3;4,5,6;7,8,9]; a=reshape(a,1,9); a=[1,4,7,2,5,8,3,6,9]; a=reshape(a,9,1); a=[1;4;7;2;5;8;3;6;9];a=[1,2,3,4,5,6,7,8,9]; a=reshape(a,3,3); a=[1,4,7;2,5,8;3,6,9];也就是说,reshape以列为主体。