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Thanks very much for the reply. Do I need to store x,y information. Because it's just a x,y are correspoding to the i and j of a[i][j] repsectively. And there is no negative values inside my matrix....

Nobody have ever ever done this? Or my question are just two stupid ?

hi, guru:
I am now having a 2d matrix a[i][j], which has a size of 1024�256. the row number stands the x-axis infomration, the column number stands for the y-axis information and the...