clear,clc
load indices
format long
% Prepare for RASTER scan [Sha93]
xm=mapping_128;
xm=xm(:);
load lena.mat
?? Error using ==> load
Unable to read file indices: No such file or directory.

Error in ==> ezw_encode_128 at 2
load indices

运行后程序报错，求救阿！怎样得到lena.mat文件阿?马上交作业了，忘好心人赐教！谢谢哦