输入2维数组和行数列数，进行之字形重新排列，输出1维数组，比如图像的DCT变换系数-DCT，zigzag

用MATLAB实现MPEG中的 ZIG-ZAG 扫描，矩阵查表实现，函数形式，很有用。-MPEG with a MATLAB implementation of the ZIG-ZAG scan matrix look-up table implementation, functional form, is useful.