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How to get equation from each plot?

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Okinawa Rikenata
Okinawa Rikenata 2018-1-25
评论： Okinawa Rikenata 2018-1-25
So I have this code:
wkt is 117*1 array
x is also 117*1 array
a=polyfit(wkt,x);
b=polyval(a,wkt);
figure
plot (wkt,x)
hold on
plot (wkt,b)
Then I get a figure with 2 different plots. My problem is how to get the equation for each plot so I can evaluate the area between 2 curves. If I use this
a=trapz(wkt,x)-trapz(wkt,b)
will I get a correct result? Or is there another way? Thank you.

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采纳的回答

Walter Roberson
Walter Roberson 2018-1-25
https://www.mathworks.com/help/matlab/ref/polyint.html polyint will integrate directly from the polynomial coefficients.

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