Question

用matlab编写，求解

保留5位小数

Answer 1

x = 0:0.1:12
plot(x,besselj(1,pi*x),x,0) %画图形，观察根（零点）的位置
r(1) = fsolve(@(x)besselj(1,pi*x),1.2); %求根
r(2) = fsolve(@(x)besselj(1,pi*x),2.2);
r(3) = fsolve(@(x)besselj(1,pi*x),3.2);
r(4) = fsolve(@(x)besselj(1,pi*x),4.2);
r(5) = fsolve(@(x)besselj(1,pi*x),5.2);
r(6) = fsolve(@(x)besselj(1,pi*x),6.2);
r(7) = fsolve(@(x)besselj(1,pi*x),7.2);
r(8) = fsolve(@(x)besselj(1,pi*x),8.2);
r(9) = fsolve(@(x)besselj(1,pi*x),9.2);
r(10) = fsolve(@(x)besselj(1,pi*x),10.2);

结果为：
r =
1.2197 2.2331 3.2383 4.2411 5.2428 6.2439 7.2448 8.2454 9.2459 10.2463