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Originally posted by 94431147 at 2010-04-23 22:04:41:
àÞ ÓеãÃ÷°×ÁË ÄÇÕâ¸öEµÄ²â¶È´óÓÚµÈÓÚ 0  ÑϸñСÓÚ1µÄÂ𣿠EÊÇXµÄÒ»¸öÕæ×Ó¼¯

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javeey(½ð±Ò+1):ллÌṩ°ïÖú 2010-04-24 10:12
wuguocheng(½ð±Ò+5, ÊýѧEPI+1):Great! 2010-04-29 21:31
ÒýÓûØÌû:
Originally posted by 94431147 at 2010-04-23 22:04:41:
àÞ ÓеãÃ÷°×ÁË ÄÇÕâ¸öEµÄ²â¶È´óÓÚµÈÓÚ 0  ÑϸñСÓÚ1µÄÂ𣿠EÊÇXµÄÒ»¸öÕæ×Ó¼¯

ÎÒÊÇ˵ \delta_{xi} ¿ÉÒÔÊǸÅÂÊÃܶȺ¯Êý
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Originally posted by jfili at 2010-04-24 09:19:53:


ÎÒÊÇ˵ \delta_{xi} ¿ÉÒÔÊǸÅÂÊÃܶȺ¯Êý
\delta_{xi}±íʾÔÚ xi Õâ¸öµãµÄ²â¶ÈΪ1,ÆäËüµã²â¶ÈΪ0,Ò²¾ÍÊÇ˵±Õ¼¯Èç¹ûº¬Óеã xi ÔòÆä²â¶ÈΪ1, ·ñÔòΪ0

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