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linear fit in plot

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I can't get to add a linear fit line,
This is my code ma and me can be ignored it is for the other plots,
and this the graph i get, i just need to have a linear fit added into it!

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Accepted Answer

Image Analyst
Image Analyst on 26 Nov 2020
Add this:
hold on;
plot(x, curve, 'b-', 'LineWidth', 3);

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Image Analyst
Image Analyst on 26 Nov 2020
I don't know why that would be true. Maybe at the beginning of your script put
close all;
So that no figure is open when you rerun it, and it will draw everything from scratch. Or you could try
cla reset;
if you wanted to keep the figure from prior runs up for some reason.
zakary Surprenant
zakary Surprenant on 26 Nov 2020
Yah i added a hold off at the end and it work now, Thanks for your help!

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