how to estimate initial conditions for lsqcurvefit function in matlab? thank u in advance.
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[x,resnorm]=lsqcurvefit(@myfun,x0,xdata,ydata);
how to set x0?? xdata(voltage) and ydata(displacement), experimental data are attached.
%%function: myfun function f=myfun(x,xdata) a=x(4)*xdata+x(5); for k=1:1:1; r(k)=x(1)*k; wo(k)=0; %%weighting function for i=1:1:length(a); a_b(k,i)=a(i)-r(k); ab(k,i)=a(i)+r(k); w(k,i)=max (a_b(k,i),min(ab(k,i),wo(k))); wo(k)=w(k,i); end pi(k)=x(2)*exp(-x(3)*r(k)); pfi(k,:)=pi(k)*w(k,:); end itpfi=sum(x(1)*pfi); f=a+itpfi;
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Star Strider
2014-4-8
Your problem is likely not your initial parameter estimates. Consider that the loop starting with:
for k=1:1:1;
will only execute once. (It will execute for k = 1 and stop.)
There may be other problems. Please format your code.
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Star Strider
2014-4-9
编辑:Star Strider
2014-4-9
I’m having problems interpreting your code. What is the original equation you want to fit?
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