matlab的inline函数报错Error using inline/feval (line 23)Not enoug

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matlab的inline函数报错Error using inline/feval (line 23)Not enough inputs to inline function
我的代码如下：
r1 = 60;
Bg = 60;
Sd = Bg/2;
n0 = 1000000000;
k = 2*pi/Bg;
z = 60;
syms x
y = inline('900-z^2-x^2+2*z*x*cos(angle(besselh(1,1,2*pi*x/60))-angle(besselh(1,1,2*pi*z/60)))','x','z');
[r2,f] = fsolve(y,z);
报错：
Error using inline/feval (line 23)
Not enough inputs to inline function.
Error in fsolve (line 241)
fuser = feval(funfcn{3},x,varargin{:});
Error in myrfun (line 12)
[r2,f] = fsolve(y,z);
Caused by:
Failure in initial user-supplied objective function evaluation.FSOLVE cannot continue.
应该是inline用的有问题,因为把inline里面的z都用60这个具体数值替代后,就可以运行了

1）syms x z;
2）fsolve的写法不对,要定初值,语法要求是 FSOLVE(FUN,X0,OPTIONS)
再问：初值就是z,还是谢谢你
再答： z是初值，方程就不能这么写了 900-z^2-x^2+。。。
再问： syms x
syms z
y = inline('900-z^2-x^2+2*z*x*cos(angle(besselh(1,1,2*pi*x/60))-angle(besselh(1,1,2*pi*z/60)))','x','z');
[r2,f] = fsolve(y,60);
我这样写还是报原先的错

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