define function to data set

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ignacio bobadilla tapia
评论： ignacio bobadilla tapia 2021-6-22
Hello, please if you could help me to fit a function to a data series, I understand that the 'fit' function of matlab works excellent, but it does not give me good results. What I have to do is fit the best possible function to a figure that has the semi-logarithmic vertical scale. I attach the data and the respective figure. Thanks greetings.
load x.txt
load y.txt
semilogy(x,y,'ob')

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回答（1 个）

KSSV
KSSV 2021-6-22
x = importdata('x.txt') ;
y = importdata('y.txt') ;
y = log(y) ;
p = polyfit(x,y,2) ;
yi = polyval(p,x) ;
plot(x,y,'.r',x,yi,'.b')

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