matlab?Input argument "a" is undefined.

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matlab?Input argument "a" is undefined.
执行如下程序：
function U=forwdif(f,c1,c2,a,b,c,n,m)
x=0:0.2:1;
h=a/(n-1);
k=b/(m-1);
r=c^2*k/h^2;
s=1-2*r;
U=zeros(n,m);
U(1,1:m)=c1;
U(n,1:m)=c2;
U(2:n-1,1)=feval(f,h:h:(n-2)*h)';
for j=2:m
for i=2:n-1
U(i,j)=s*U(i,j-1)+r*(U(i-1,j-1)+U(i+1,j-1));
end
end
U=U';
报错 :
Input argument "a" is undefined.
Error in ==> forwdif at 3
h=a/(n-1);

U=forwdif(f,c1,c2,a,b,c,n,m)
输入 a没定义.你看看参数a 传递了没有.在主程序里看.
这个是子函数.通过上面这个语句传入子函数,
在主程序里检查 forwdif(f,c1,c2,a,b,c,n,m) 中的 a

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