How should I pick input for jocabian() function im this case?

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Lu zhang
Lu zhang 2016-11-17
回答： KSSV 2016-11-18
I want to calculate the gradient for a user-defined function using the jocabian() function.In the subfunction fcn, I pick subset from a larger parameter vector that is defined in the main program like
function fm = fcn(b)
``````
global T T_z T_e zt et
teta =0;
zt =b(1:T_z); % Line-7 fcn%
et =b(1+T_z:T_z+T_e);
dify =zeros(T,T);
````
As one can see, [zt,et] are parameter I define in the subfunction fcn and on which I calculate the gradient. However, when I feed the input argument like the following and run the program,
[b,fun,flag] = fminunc(@cov,b0);
v = [zt,et]';
dfb = jacobian(fcn,v);
Matlab warned me that
Error using fcn (line 7)
Not enough input argument
I remark the location of error in the fcn function.I don't know why there is a problem. The definition of both et and zt seems without problem.Do I miss something?

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回答（1 个）

KSSV
KSSV 2016-11-18
Check the line:
dfb = jacobian(fcn,v);
In the above fcn is a function. You have to give input b to the function, which you have not.

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