Fitting data with custom equation

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anubha agarwal
anubha agarwal 2020-11-18
评论： Ameer Hamza 2020-11-25
Hi,
I have a data set of X-axis and Y-axis. I have attched the Excel file of my data.
So i want to fit this data in a equation P(t) = At^(−(1+α))e(−t/tc).
I want to do this by curve fitting? I'd like to obtain the parameter α,tc as an answer.
please let me know how to do this.
  1 个评论
Rik
Rik 2020-11-18
What was the top google result when you searched for a solution? How did you try to implement it?

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Ameer Hamza
Ameer Hamza 2020-11-18
You can use lsqcurvefit()
data = readtable('data set.xlsx');
x = data.LOGX;
y = data.LOGY;
P = @(param, t) param(1)*t.^(-(1+param(2))).*exp(-t/param(3));
sol = lsqcurvefit(P, rand(3,1), x, y);
plot(x, y, '+', 'DisplayName', 'Actual Data')
hold on
plot(x, P(sol, x), 'DisplayName', 'Estimated')
legend()
  2 个评论
anubha agarwal
anubha agarwal 2020-11-25
I am obtaining the complex value of parameters even after changing the upper and lower bounds of the parameters.
Ameer Hamza
Ameer Hamza 2020-11-25
Can you show the data which gives complex parameters?

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