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3Â¥: Originally posted by zaq123321 at 2014-12-02 01:40:50
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2Â¥: Originally posted by pippi6 at 2014-12-01 12:53:04
ÆäʵÂÛÎÄÀïºÍÄãµÄÍÆµ¼½á¹ûÒ»Ö£¬×¢Òâµ½factor 2 ±»Ï÷µô£¨ÒòΪÆë´Î£©£¬»¹ÓоÍÊÇMºÍ Lambda¶¼ÊǶԳƾØÕó¡£¾ÍÊÇÒ»µãÈÃÎÒ¾õµÃÆæ¹Ö£¬³Ë»ýÓ¦¸ÃÊÇÒ»¸öÊý£¬¿ÉÊÇΪʲôҪÓÃtrace£¿ µ±ÈÔȻһ¸öÊýµÄtrace¾ÍÊÇÊý±¾Éí£¬²¢²»Ó°Ïì½á ...

ÆäʵÂÛÎÄÀïºÍÄãµÄÍÆµ¼½á¹ûÒ»Ö£¬×¢Òâµ½factor 2 ±»Ï÷µô£¨ÒòΪÆë´Î£©£¬»¹ÓоÍÊÇMºÍ Lambda¶¼ÊǶԳƾØÕó. Is correct.

¾ÍÊÇÒ»µãÈÃÎÒ¾õµÃÆæ¹Ö£¬³Ë»ýÓ¦¸ÃÊÇÒ»¸öÊý£¬¿ÉÊÇΪʲôҪÓÃtrace£¿ µ±ÈÔȻһ¸öÊýµÄtrace¾ÍÊÇÊý±¾Éí£¬²¢²»Ó°Ïì½á¹û¡£

Note that X and Q are matrices other than vectors. Products are still matrices.
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3Â¥2014-12-02 01:40:50
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3Â¥: Originally posted by zaq123321 at 2014-12-02 01:40:50
ÆäʵÂÛÎÄÀïºÍÄãµÄÍÆµ¼½á¹ûÒ»Ö£¬×¢Òâµ½factor 2 ±»Ï÷µô£¨ÒòΪÆë´Î£©£¬»¹ÓоÍÊÇMºÍ Lambda¶¼ÊǶԳƾØÕó. Is correct.

¾ÍÊÇÒ»µãÈÃÎÒ¾õµÃÆæ¹Ö£¬³Ë»ýÓ¦¸ÃÊÇÒ»¸öÊý£¬¿ÉÊÇΪʲôҪÓÃtrace£¿ µ±ÈÔȻһ¸öÊýµÄtrace¾ÍÊÇ ...

Right, it must be so. Even when Q,X are matrices, the derivation still holds. Thx for shedding lights.
5Â¥2014-12-02 07:20:39
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