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rongxue6808新蟲(chóng) (正式寫(xiě)手)
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[交流]
【求助】matlab擬合log(T)=A/T+Bx+C失敗【已解決】
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現(xiàn)在有一系列對(duì)應(yīng)的T和x T x 435 -0.787333071000000 435 -0.768020973000000 438 -0.572708685000000 446 -0.307452697000000 459.5 -0.130721332000000 477 -0.0767559810000000 494 -0.0203287290000000 497.2 -0.0129283930000000 498 0 498.5 -0.0122622520000000 498.8 -0.0308824180000000 matlab擬合log(T)=A/T+Bx+C失敗,給出的error message:Fit could not be computed due to error: Inf computed by model function, fitting cannot continue. Try using or tightening upper and lower bounds on coefficients. 然后我嘗試調(diào)Parematers的start point和起始范圍,始終失敗,錯(cuò)誤信息一直如上! 請(qǐng)各位高手幫忙呀!我是按照這個(gè)帖子一步步來(lái)的 http://www.gaoyang168.com/bbs/viewthread.php?tid=2557107 [ Last edited by nono2009 on 2010-12-1 at 07:21 ] |
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金蟲(chóng) (小有名氣)
新蟲(chóng) (正式寫(xiě)手)
新蟲(chóng) (正式寫(xiě)手)
新蟲(chóng) (正式寫(xiě)手)
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>> t=[435 435 438 446 459.5 477 494 497.2 498 498.5 498.8 ]; x=[-0.78733 -0.76802 -0.57271 -0.30745 -0.13072 -0.07676 -0.02033 -0.01293 0 -0.01226 -0.03088 ]; >> y=log(t); >> a=1./t; b=x; c=[1 1 1 1 1 1 1 1 1 1 1 ]; plot3(a,b,y) A=[a b c] A = 0.0023 -0.7873 1.0000 0.0023 -0.7680 1.0000 0.0023 -0.5727 1.0000 0.0022 -0.3075 1.0000 0.0022 -0.1307 1.0000 0.0021 -0.0768 1.0000 0.0020 -0.0203 1.0000 0.0020 -0.0129 1.0000 0.0020 0 1.0000 0.0020 -0.0123 1.0000 0.0020 -0.0309 1.0000 >> pinv(A)*y ans = -480.2144 -0.0062 7.1746 |
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