How can I graph several points from a table and extrapolate a curve?

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Stephen 2013-12-9

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评论： Stephen 2013-12-9

I'm somewhat new to MATLAB, although I used it in school. I have a table of x and y-values, and want to plot the points on a graph and then extrapolate a linear curve. Can someone help explain how to do this? I am used to graphing with equations, this is sort of the opposite way around.

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Answer 1

dpb 2013-12-9

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在 MATLAB Online 中打开

Well, poly[fit|val] are "all in Matlab"...

dat=[1500,200; 2500,259; 4530,1980];
plot(dat(:,1),dat(:,2))
p=polyfit(dat(:,1),dat(:,2),1);
yhat=polyval(p,[1000 5000]);
hold on
plot([1000 5000],yhat)

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Stephen 2013-12-9

Thank you, you've been very helpful.

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Answer 2

dpb 2013-12-9

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A) doc plot

B) doc polyfit % and polyval

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Stephen 2013-12-9

Thank you. If I'm looking more to do it all in matlab, then, say I'm starting at a data range like

x=1000:10:5000; y=0:.5:2000;

and I want to plot several points, say (1500,200) (2500,259) and (4530,1980) and then apply the polyfit % and polyval functions. How would I accomplish something like that?

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