use of polyxpoly to find roots

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vipul kumar
vipul kumar 2020-4-23
编辑： Pravin Jagtap 2020-4-28
I have used this code to find the roots but it is giving an error.
clc
clf
b=linspace(0,1);
x=8;
p= x.*(sqrt(1-b)).*(((besselj(1,x.*sqrt(1-b)))./(besselj(0,x.*sqrt(1-b)))));
q = x.*(sqrt(b)).*((besselk(1,x.*sqrt(b)))./(besselk(0,x.*sqrt(b))));
plot(b,p)
hold on
plot(b,q)
[xx,yy] = polyxpoly(b,p,b,q)

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回答（1 个）

Pravin Jagtap
Pravin Jagtap 2020-4-27
编辑：Pravin Jagtap 2020-4-28
Hello Vipul,
Refer to the following documentation for understanding how 'ployxpoly' works:
https://www.mathworks.com/help/map/ref/polyxpoly.html
From your code, I can see that the first value of 'q' vector is 'NaN' (Not a Number) which is not acceptable. Please check how you can handle that corner case.
Hope this will help you.

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