matlab 矩阵按照行列数值大小排序

  [m,n]=size(y);
  y1 = reshape(y,1,[]);
  y2 = sort(y1,'descend');
  y3 = reshape(y2,m,n);             %把矩阵y的元素按照从大到小排列

A=reshape(sort(reshape(abs(y),1,[]),'descend'),3,3)               %3*3的矩阵排序