## I am beginner of Matlab. While I use MATLAB to solve the problem of constrained nonlinear optimization, "Lack of input arguments" are always warning.Did someonecan tell me how to slove this probrem?THx

Asked by GAO Si

### GAO Si (view profile)

on 7 Dec 2012

function f=optfun(x) f=-x(1)*x(2)*x(3); %fmincon_example.m X0=[1,1,1]; A=[1,2,2;0,1,0;0,0,1]; b=[72;5;10]; x=fmincon(optfun,X0,A,b) end

#### 1 Comment

Muruganandham Subramanian

### Muruganandham Subramanian (view profile)

on 7 Dec 2012

'x' is an input argument or output argument?

## Products

### Vishal Rane (view profile)

Answer by Vishal Rane

### Vishal Rane (view profile)

on 7 Dec 2012

```function f=optfun(x)
f=-x(1)*x(2)*x(3); %fmincon_example.m
X0=[1,1,1];
A=[1,2,2;0,1,0;0,0,1];
b=[72;5;10];
x=fmincon(optfun,X0,A,b)
end
```

You are not providing the input x to optfun when passing it as an input to fmincon (last line) .

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