有一个算法不知道怎么写，报错，请大虾帮看看，谢谢！

[basicx]

>> f=@(x)('(60000+4x)./(5200+x)');
>> ezplot(f);
??? In an assignment A(I) = B, the number of elements in B and
I must be the same.

Error in ==> specgraph\private\ezplotfeval>applyfun at 81
z(i) = feval(f,x(i));

Error in ==> specgraph\private\ezplotfeval at 68
z = applyfun(x);

Error in ==> ezplot>ezplot1 at 433
[y,f,loopflag] = ezplotfeval(f,x);

Error in ==> ezplot at 140
[hp,cax] = ezplot1(cax,f{1},vars,labels,args{:});

[meteora1005]

呵呵，你定义匿名函数f时错了，应该这样：
f=@(x)((60000+4*x)./(5200+x));
不用加单引号，4和x间要加乘号