how to display coefficient and offset on graph?

2019 6 17
1 个回答
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更新时间：2019 6 17
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I'd like to display some values to plot. What should I do ?
A=xlsread('A.xlsx');
t=A(:,1);
i=A(:,2)/10^(2);
ft = fittype('a*exp(-x/b)+c');
F=fit(t,i,ft)
b = 1/F.b;
offset = F.c;
plot(t,i);
hold on;
plot(F)
hold off
It's an example plot, I'd like to make a plot through codes like this figure.
Capture.PNG

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Vishnu Vardhan
Vishnu Vardhan 2019-6-17

0 个投票

Hi Jaehwi
You can use text function available in MATLAB by specifying the location of text wherever you want.
txt = {'b=0.007','Offset='};
text(220,10.5,txt)
This documentation may help you further

6 个评论
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Jaehwi Bong
Jaehwi Bong 2019-6-17
Thank you for your answer.
I'd like to display those values on the plot from the result of fitting.
Vishnu Vardhan
Vishnu Vardhan 2019-6-17
you can replace with
txt = {'b=' num2str(b) 'Offset='}
Jaehwi Bong
Jaehwi Bong 2019-6-17
I can't still anything on the plot.
plot(t,i);
hold on
plot(F)
hold off
xlabel('Frame number')
ylabel('Intensity')
txt = {'b=' num2str(b) 'Offset=' num2str(offset)};
text(700,10.5,txt,'FontSize',14))
It plots without text...
Vishnu Vardhan
Vishnu Vardhan 2019-6-17
It looks like your x and y co-ordinates are out of the chart for the text function.
It should be something like this
text(220,10.5*10^5,txt,'FontSize',14)
Vishnu Vardhan
Vishnu Vardhan 2019-6-17
fitoptions should work fine , Once verify whether limits are correct.
Once go through this link , might help you in someway.

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