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i-th are "1", and others - "0"(zero)
2Â¥2011-01-20 19:23:42
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3Â¥2011-01-20 19:24:06
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liuwen9266(½ð±Ò+3, ·­ÒëEPI+1): лл 2011-01-21 10:16:33
Áîe =  (0,...,0,1,0,...,0)ÊǵÚi¸öλÖÃÊÇ1£¬ÆäÓàλÖÃÊÇ0 µÄÒ»¸öÏòÁ¿¡£

Let the vector e equals (0,...,0,1,0,...0), where the i-th position being "1", while the others "0".
4Â¥2011-01-21 00:01:02
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