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how to solve the error in Lsqcurvefit

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Sou Fat 2023-4-14

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回答： Sou Fat 2023-4-14

a.png

在 MATLAB Online 中打开

hi guys

i need help for the error i got it , with the function lsqcurvefit, i don't know exactely how to solve this probleme.

Thank you,

this is my script:

clear all
clc
load('RCS1190_460A.mat')
xdata=Times; 
i=460
%%    RCS1190_460A             %%%%%%%%%%%%%%%%%ù
ydata= QC_plusC-45;
fun=@(x,xdata)((x(1)./x(2)).*(  1-   (exp(-(x(2)).*xdata))))
x0=[2,1]
x=lsqcurvefit(fun,x0,xdata,ydata)

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Torsten 2023-4-14

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在 MATLAB Online 中打开

Execute

load('RCS1190_460A.mat')
xdata=Times; 
i=460;
%%    RCS1190_460A             %%%%%%%%%%%%%%%%%ù
ydata= QC_plusC-45;
fun=@(x,xdata)((x(1)./x(2)).*(  1-   (exp(-(x(2)).*xdata))));
x0=[2,1];
test_y = fun(x0,xdata)

and check whether "test_y" has Inf or NaN elements.

Sou Fat 2023-4-14

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I ran your code and found that test_y has a value,

Sou Fat 2023-4-14

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I have the same error you saw it in the picture when i run the code with this "x=lsqcurvefit(fun,x0,xdata,ydata)"

Torsten 2023-4-14

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编辑：Torsten 2023-4-14

test_y must return a list of values of the same size as your "ydata" and there mustn't be any NaN or Inf values in it.

Any of these conditions cannot be true in your case because lsqcurvefit gets garbage back when it calls "fun" with your xdata and your initial parameter vector x0.

Sou Fat 2023-4-14

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exactly what I found a list of value of the same size as my ydata but when i tried to run the function lsqcurvefit, so i don't how to solve this probleme . thank you for your answer

Torsten 2023-4-14

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But it says your objective function returns undefined values at the initial point.

So "test_y" must contain Inf or NaN values.

Sou Fat 2023-4-14

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B.png
C.png

i don't know, look at these picture that when i run the code without lesqcurvefit, it's work

Sou Fat 2023-4-14

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you think i have problem in the ydata ?

Torsten 2023-4-14

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编辑：Torsten 2023-4-14

在 MATLAB Online 中打开

Try what you get from

any(isnan(fun(x0,xdata)))
any(isinf(fun(x0,xdata)))

If one of them returns 1, you have a problem with the xdata and/or the evaluation of your function.

Do the same for your ydata.

Sou Fat 2023-4-14

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i found any(isnan(fun(x0,xdata))) return 1.

and second any(isinf(fun(x0,xdata))) return 0

Sou Fat 2023-4-14

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i did the same for ydata and i found the both return 0

Sou Fat 2023-4-14

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I rectified in the tebalu that it misses a value I rectified it then I verified the two any(isnan(fun(x0,xdata)))

any(isinf(fun(x0,xdata))) and fo ydata which return 0

Torsten 2023-4-14

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So no more errors ?

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Sou Fat 2023-4-14

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Yes I didn't find the error thank you for your help

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how to solve the error in Lsqcurvefit

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