请教非线性拟合问题！！
function nnnx=[-2.018,-1.818,-1.236,-1.018,-0.855,-0.018,0.291,0.691];
y=;
beta0=;
=nlinfit(x,y,'volum',beta0); %非线性拟合函数的系数、残差
nlintool(x,y,'volum',beta0) %拟合曲线图
beta
plot(x,y,'o')
function yy=volum(beta,x)
yy=beta(1)./(1+(beta(1)/1.139-1)*exp(-beta(2)*(x+0.855)));
上面是我编的非线性拟合的M文件，x和y是拟合数据，yy为拟合公式。运行后出现如下错误：
??? Error using ==> nlinfit
The model function 'volum' generated the following error:
Error using ==> volum
Too many input arguments.
Error in ==> nnn at 5
=nlinfit(x,y,'volum',beta0); 非线性拟合函数的系数、残差
请大家帮忙解决！谢谢
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