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      /  ¤@±ø¥O³¦h¤H©ü­ËªºÃD¥Ø Lagrange Multiplier
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µù¥U¤é: 2005-02-20
µoªí¼Æ: 4


 ¤@±ø¥O³¦h¤H©ü­ËªºÃD¥Ø Lagrange Multiplier

¤@±ø¥O³¦h¤H©ü­ËªºÃD¥Ø Lagrange Multiplier


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http://mathforum.org/library/drmath/view/52071.html

Date: 11/24/98 at 16:29:56
From: Sam
Subject: LaGrange Multiplier

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§Ú¦³¤@­Ó²³æªº°ÝÃD¡A¬O¦³Ãö©ó®Ô«a¦N«Y¼Æ
¡]LaGrange Multiplier¡^ªºÃD¥Ø¡A§Úªº®Ú¥»
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¨î±ø¥ó¦¡¡H¤j¦h¼ÆªºÃD¥Ø³£©ú½T«ü¥X¥Ø¼Ð¤èµ{
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«ö·Ó¸ÑÃD¨BÆJ°µ¤U¥h¡C¦ý¬O¡A³o¤@¹DÃD¥Ø¤£¤Ó
¦n°µ¡AÃD¥Ø¤¤¨ºùØ©ú½T«ü¥X­­¨î±ø¥ó¦¡©O¡H¨Ò
¦p¡A³oùئ³¤@±ø§@·~ÃD¡C

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¦³¨â±ø¦±½u¡A¨C±ø½u¤W¦³¤@­ÓÂI¥i¥H¦Û¥Ñªu½u
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y = 2x - 3
y = x^2
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y = 2x - 3
y = x^2
³£¬O­­¨î¦¡¡I§A¥i¯àª¾¹DÃD¥Ø¥i¥H¥X²{¦h­Ó­­
¨î¦¡¡C§A¥²¶·¹ï¨C¤@­Ó­­¨î¦¡¨Ï¥Î¤@­Ó®Ô«a¦N
«Y¼Æ¡C­­¨î¦¡ªº·N«ä¬O»¡¨¾¤î§AÂ÷¶}©w¸q°ì¡C
³o¤@¹DÃD¥Øªº«Ý·¥¤p¤Æ¥Ø¼Ð¨ç¼Æ¡]©Î«Ý³Ì¨Î¤Æ
¡^¬O¨âÂI¤§¶¡ªº¶ZÂ÷¡C
(x[1],y[1]) ¤Î (x[2],y[2]) ¨âÂI¡C
ÅãµM§Ú­Ì¥i¥H¥O¨âÂIºÉ¥i¯à±µªñ¡Aª½¨ì¶ZÂ÷¬°
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²Ä¤@±ø¦±½u¤W¡B²Ä¤GÂI¥²¶·¦b²Ä¤G±ø¦±½u¤W¡C

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¡]¦Û¥Ñ¤Hµù¡R¦¹³BÀ³¸Ó¬O¡u¬I¥H·¥¤p¤Æ¡v¡^
¥Ø¼Ð¨ç¼Æ¬°
sqrt[(x[1]-x[2])^2 + (y[1]-y[2])^2],
¦P®É¨ü¨ì­­¨î±ø¥ó
y[1] = 2x[1] - 3,
¤Î
y[2] = x[2]^2.
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94,01,22,11,27¤î

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y = 2x - 3
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¡]¤W­±¬O¤s©i¡B©|¹Ï½×ÃD¡A¥»¤å¸Ñ¦¹ÃD¡C
¡@¤U­±¬O¤£¦PªºÃD¥Ø¡A¥u¬OÁ|¨Ò¡A¨S¦³¸ÑÃD¡^

G(x,y) = (x-1)*(x-1) + (y-2)*(y-2)
R(x,y) = x + y - 3 = 0

G(x,y) ¥Nªí¥Ø¼Ð¨ç¼Æ (Goal)
R(x,y) ¥Nªí­­¨î±ø¥ó (Restriction)

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¥Ø¼Ð¨ç¼Æ¥i¥H·¥¤p¤Æ¡]³Ì¤p¦¨¥»¡^¡C
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ÃD¡A¨Ã¥BºÙ¥Ø¼Ð¨ç¼Æ¬°¦¨¥»¨ç¼Æ¡CÅ¥¨£¡u¦¨¥»
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¡v¥u¬O§Î®eµü¡C

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G(x,y) = (x-1)*(x-1) + (y-2)*(y-2)

¨ü¨ì­­¨î±ø¥ó
R(x,y) = x + y - 3 = 0

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­­¨î±ø¥ó¤½¦¡¡@¡×¡@¢¯

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«Ý·¥¤p¤Æ¥Ø¼Ð¨ç¼Æ G(x,y)
­n»P¡@¡@­­¨î±ø¥ó R(x,y) ¬Û¥[¡A¦¨¬°½Æ¦Xªº
®Ô«a¦N¨ç¼Æ L(x,y)=G(x,y)+lambda*R(x,y)
¨ä¤¤ lambda¬O®Ô«a¦N«Y¼Æ¡C¤]´N¬O
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¡]½Ðª`·N¤W­z®Ô«a¦N¨ç¼Æ»P¥Ø¼Ð¨ç¼Æ¤§®t§O¡^

­Y­­¨î±ø¥ó R(x,y) «íµ¥©ó¹s¡A¥Ø¼Ð¨ç¼Æ¥[¹s
¤£§ïÅܥؼШç¼Æªº­È¡C¤]´N¬O
¦pªG­­¨î±ø¥ó¥þ³¡½Õ¾ã¬°µ¥©ó¹s¡A¨º»ò¡A
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®Ô¨ç¼Æ¡×¥Ø¼Ð¨ç¼Æ¡Ï®Ô«Y¼Æ¡¯(x+y)¡@¡]¿ù¡I¡^
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¦b°õ¦æ®Ô«a¦N¨ç¼Æ¹ï®Ô«a¦N«Y¼Æ·L¤Àªºµ²ªG
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¡u·L¤Àªºµ²ªG¥O¬°¹s¡v¤£¯àÁÙ­ì­­¨î±ø¥ó¦¡¡I

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¡´¡@¤@­Ó¡uµ¥©ó¹s¡v¡A¦p¦¹¤~¥i¯àÁÙ­ì­­
¡´¡@¨î±ø¥ó¡C

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¡´¡@¬JµM­­¨î±ø¥ó R(x,y) «íµ¥©ó¹s¡A
¡´¡@¬G¡u = 0¡v¸g±`²¤°£¡A

ÃD¥Ø²¤Æ¬°¡]²¤°£¡u = 0¡v¡^
·¥¤p¤Æ G(x,y) = (x-1)*(x-1) + (y-2)*(y-2)
­­¨î¦¡ R(x,y) = x + y - 3

¬°¤°»ò­n¥Î G(x,y) ¤Î R(x,y) ¡H
¤£¥Î G(x,y) ¤Î¤£¥Î R(x,y) ¥i¥H¶Ü¡H

¥kºÝªºÁcÂø¤½¦¡¥H¥ªºÝ²²Å¥Nªí¡C

¸ÑÃD¨BÆJ»Ý­n©w¸q®Ô«a¦N¨ç¼Æ¦p¤U
L(x,y)=G(x,y)+lambda*R(x,y)
¤ñ¸ûºë²¡C¦pªG¤£¥Î²²Å¥Nªí¡Aª½±µ¼g¬°
L(x,y)=(x-1)*(x-1) + (y-2)*(y-2)+lambda*(x + y - 3)
¤ñ¸ûÁcÂø¡A©Ò¥H¨Ï¥Î G(x,y) ¤Î R(x,y) ¡C

²Ö¿n¥H¤Wªº­I´º±ø¥ó¤§«á¡A
¤U­±ªº¦C¦¡¡]²¤°£¡u = 0¡v¤Î¨Ï¥Î G, R¡^
G(x,y) = (x-1)*(x-1) + (y-2)*(y-2)
R(x,y) = x + y - 3
¨Ï·s¤â§x´b¡I

¬O
·¥¤p¤Æ G(x,y) = (x-1)*(x-1) + (y-2)*(y-2)
­­¨î¦¡ R(x,y) = x + y - 3
¶Ü¡H

¬O
·¥¤p¤Æ R(x,y) = x + y - 3
­­¨î¦¡ G(x,y) = (x-1)*(x-1) + (y-2)*(y-2)
¶Ü¡H

¬O»{©w G(x,y) ¬°¥Ø¼Ð¨ç¼Æ¶Ü¡H¦ý¬O
G(x,y)¬OÀH·N¥N²Å¡A¦pªG§ï¥Î
C(x,y) = x + y - 3
D(x,y) = (x-1)*(x-1) + (y-2)*(y-2)
§Ú«ç»òª¾¹D½Ö¬O½Ö¡H¡I

¬°¦¹¡A¦Û¥Ñ¤H´¿¸g­W«ä«Ü¤[¡C³Ì«áª`·N¨ä®t§O

·¥¤p¤Æ¤½¦¡ªº G(x,y) ¬OÅÜ°Ê­È¡A¤£¯àÂꦺ¡C
­­¨î¦¡ªº¡@¡@ R(x,y) ¬O©T©w­È¡A¤£¯àÅÜ°Ê¡C
¡´¡@½Ðª`·N¡A¤W­±¨â¦æ¬O­«ÂI¡I¡@¡´

·¥¤p¤Æ¤½¦¡ªº G(x,y) ¬OÅÜ°Ê­È¡A¤£¯àÂꦺ¡C
¦]¬°¡u·¥¤p¤Æ¡vªº·N«ä¬O¦³¦h­«¿ï¾Ü¡A
¦pªG«ü©w G(x,y) µ¥©ó¹s¡A©Î
¦pªG«ü©w G(x,y) µ¥©ó¤@¡A½Ð·Q¤@·Q¡A
G(x,y) = (x-1)*(x-1) + (y-2)*(y-2)
µ¥©ó±`¼Æ¡H
¤w¸gÂê©w¤F¡A¤£¥i¯à°õ¦æ·¥¤p¤Æ¡I¡I

¥t¤@¤è­±¡A
­­¨î¦¡ªº¡@¡@ R(x,y) ¬O©T©w­È¡A¤£¯àÅÜ°Ê¡C
¦pªG R(x,y) = x + y - 3 µ¥©óÅÜ°Ê­È¡A³o´N
¤£¬O­­¨î±ø¥ó¤F¡I
R(x,y) = x + y - 3 = 0 Âê©w x, y Ãö«Y
R(x,y) = x + y - 3 = ¥ô·N­È¡A x, y µLÃö

²{¦b¦^¨ì¤s©iªº°ÝÃD¡A¤wª¾¨â­Ó¤½¦¡
y = 2x - 3
y = x^2
¥i¥H§ï¼g¦p¤U
y - 2x + 3 = 0
y - x^2 = 0
³£¬Oµ¥©ó±`¼Æ¡]¹s¡^ªº¤½¦¡¡A©Ò¥H¤GªÌ³£¬O­­
¨î¦¡¡C¡]¦¹³B¦Û¥Ñ¤H¦^µª¤F¤s©iªº°ÝÃD¡^

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sqrt[(x[1]-x[2])^2 + (y[1]-y[2])^2]

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y = 2x - 3¡@¡K¡K¢Ï¢´¢±¦¡
y = x^2¡@¡@¡@¡K¡K¢Ï¢´¢²¦¡

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 2005-02-20 04:44­Ó¤H¸ê®Æ«ô³Xºô¯¸


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