So I have this code:

wkt is 117*1 array

x is also 117*1 array

`a=polyfit(wkt,x);b=polyval(a,wkt);figureplot (wkt,x)hold onplot (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.

## Best Answer