请问这个最优规划问题计算报的错误什么意思？。

首先感谢@winner245，根据@winner245的建议，重新修订了函数（下面是修改后的代码），但又遇到了新的问题：

目标函数m文件：

function f = objfun(x)

P0=100;

d=0.0269;

sigma=0.3315;

K=88.254;

T=4.3122;

r=0.0435;

d1=log((P0*exp(-d*T))/(K*exp(-r*T)))/(sigma*sqrt(T))+sigma*sqrt(T)/2;

d2=d1-sigma*sqrt(T);

BS=P0*exp(-d*T)*normpdf(d1)-K*exp(-r*T)*normpdf(d2);

f = x(1)+x(2)*P0+x(3)*BS;

约束条件函数m文件：

function [c, ceq] = confun(x)

% Nonlinear inequality constraints

c = [];

gamma=3;

P0=100;

d=0.0269;

sigma=0.3315;

K=88.254;

T=4.3122;

r=0.0435;

W0=1.1465;

PT=@(u)(P0*exp((r-d-sigma^2/2)*T+u*T^(1/2)*phi));

WT=@(u)((x(1)+W0)*exp(r*T)+x(2)*exp(d*T)*PT+x(3)*max(PT-K,0));

F=@(u)(WT^(1-gamma)*normpdf(u));

if (max(PT-K,0)>0)

I=1;

else

I=0;

end

G=@(u)WT^(-r)*(x(2)*exp(d*T)+x(3)*I)*PT/P0*normpdf(u);

% Nonlinear equality constraints

ceq =[1/(1-gamma)*quad(F,10000,10000),quad(G,10000,10000)];

Command Window：

>> x0 = [1,1,1]; % Make a starting guess at the solution

options = optimset('Algorithm','active-set');

[x,fval,exitflag,output,lambda,grad,hession]=fmincon(@objfun,x0,[],[],[],[],[],[],@confun,options)

结果：

Undefined function 'minus' for input arguments of type 'function_handle'.

Error in confun (line 15)

if (max(PT-K,0)>0)

Error in fmincon (line 681)

[ctmp,ceqtmp] = feval(confcn{3},X,varargin{:});

Caused by:

Failure in initial user-supplied nonlinear constraint function evaluation. FMINCON cannot continue.

新问题：请问下面两句话什么意思：

Undefined function 'minus' for input arguments of type 'function_handle'.

[ctmp,ceqtmp] = feval(confcn{3},X,varargin{:});

还有就是

if (max(PT-K,0)>0)

I=1;

else

I=0;

end

嵌套的位置有点问题，麻烦大伙帮忙想想办法，问题有点多，先谢谢大家！

Answer 1

[bagahe]

错误提示已经很清楚了，Attempted to access x(0); index must be a positive integer or logical.

出错语句是：f = x(0)+x(1)*P0+x(2)*BS;

下标索引（非逻辑索引）必须是自然数，即1,2,3 ...

所以，应该是：f = x(1)+x(2)*P0+x(3)*BS;