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From: Sadegh on 23 Apr 2010 13:23 Dear all, I have a problem with Curve fitting to do plot the non linear data, acually i dont know how i can i write my code in handel function form. my data is t=[0 1 5 10 30 60]; x =[0 6.184643214 12.3971795732342 15.5396860252275 30.2822273003942 43.5891026211365]; plot(t,x,'o'); xlabel('Time'); ylabel('Blood Concentration'); and my equation is :A*(log(1+B*t))=x coefEsts = nlinfit(t,x, modelFun, startingVals); I wonder to know how can i write my equation in modelfun in nlinfit command and what should be the starting point. Please Kindly send me solution as soon as poss
From: John D'Errico on 23 Apr 2010 13:44 "Sadegh " <sadegh.pub(a)gmail.com> wrote in message <hqsl1q$6rg$1(a)fred.mathworks.com>... > Dear all, > > I have a problem with Curve fitting to do plot the non linear data, acually i dont know how i can i write my code in handel function form. A Handel function? Like this? load handel sound(y,Fs) > my data is > t=[0 1 5 10 30 60]; > x =[0 6.184643214 12.3971795732342 15.5396860252275 30.2822273003942 43.5891026211365]; > > plot(t,x,'o'); > xlabel('Time'); ylabel('Blood Concentration'); > > and my equation is :A*(log(1+B*t))=x > > coefEsts = nlinfit(t,x, modelFun, startingVals); > I wonder to know how can i write my equation in modelfun in nlinfit command and what should be the starting point. > > Please Kindly send me solution as soon as poss Oh, THAT kind of handle. How boring. fun = @(coef,t) coef(1)*log(1+coef(2)*t); nlinfit(t,x,fun,[1,10]) ans = 17.753 0.16543 John
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