Yi Xing wrote: > Thanks! I just found that that I have no problem with > x=[[10.0]*2560*2560]*500, but x=range(1*2560*2560*30) doesn't work.
That's no surprise. In the first case, try x[0][0] = 20.0 print x[1][0] You have the very same (identical) list of 2560*2560 values in x 500 times. To create such a structure correctly, do x = [None] * 500 for i in range(500) x[i] = [10.0]*2560*2560 In any case, check ulimit(1). Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
