Hello everyone, how to write the code to calculate the similarity coefficient of two curves?Another problem is that when fitting a curve, the interval of a curve x is [-3,3], and it will exceed this interval when fitting a curve. I don’t know where t

code:

load jizuobiao1.mat
f1= fit(THETA11,RHO11,'smoothingspline','SmoothingParam',0.99);%smoothingspline
plot(f1,THETA11,RHO11)

load jizuobiao2.mat
f2 = fit(THETA12,RHO12,'smoothingspline','SmoothingParam',0.99);%smoothingspline
plot(f2,THETA12,RHO12)

Answer 1

[KSSV]

load jizuobiao1.mat
RHO11 = XX1 ; 
THETA11 = linspace(-pi,+pi,length(RHO11))' ; 
f1= fit(THETA11,RHO11,'smoothingspline','SmoothingParam',0.99);%smoothingspline

load jizuobiao2.mat
RHO12 = XX3 ; 
THETA12 = linspace(-pi,+pi,length(RHO12))' ; 
f2 = fit(THETA12,RHO12,'smoothingspline','SmoothingParam',0.99);%smoothingspline
%% 
x = THETA11 ; 
y1 = f1(x) ;
y2 = f2(x) ;
plotregression(y1,y2)
plot(x,y1,'r',x,y2,'b')

[Wesley]

Thank you very much for your reply. It is quite different from the curve I drew before. Is there a way to be the same as the previous curve?

[KSSV]

I have taken THETA11 and THETA12 to lie between (-pi,+pi), in your code you have not defined them. You have the code in hand, you can extend it to your input values.

[Wesley]

I'm really sorry, I still don't know how to solve this problem. Please further explain how to write the code.