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Shoney

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[ Last edited by Shoney on 2011-1-14 at 01:19 ]
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jfili

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Shoney(½ð±Ò+5):ллӦÖú 2011-01-14 10:31:57
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f(c)±í´ïʽ×îºóÒ»²¿·Ö¶ÔcÇ󵼿ɵà ln(c/1-c)
\nabla [(c)(1-c)\nabla lnc/(1-c)]
=\nabla[(1-c)\nabla c+c\nabla c]
=\nabla^2 c
2Â¥2011-01-14 09:01:55
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Shoney

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ÒýÓûØÌû:
Originally posted by jfili at 2011-01-14 09:01:55:
£¨2£©Ê½ÓÒ²àµÄµÚ¶þÏîÊÇÓÉf(c)±í´ïʽ×îºóÒ»²¿·ÖµÃµ½µÄ

f(c)±í´ïʽ×îºóÒ»²¿·Ö¶ÔcÇ󵼿ɵà ln(c/1-c)
\nabla [(c)(1-c)\nabla lnc/(1-c)]
=\nabla[(1-c)\nabla c+c\nabla c]
=\nabla^2 c

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[ Last edited by Shoney on 2011-1-14 at 10:21 ]
3Â¥2011-01-14 10:15:43
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