Failure in initial objective function evaluation. in fgoalattain

Question

Li Xu 2022-4-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1695585-failure-in-initial-objective-function-evaluation-in-fgoalattain

回答： Riccardo Scorretti 2022-4-13

Hi Guys

I got some problem to run this code:

funn = @(x,y,z)[(0.42305*x+0.043383*y+0.16814*z-0.78716).^2;(-0.631363873*x-0.258982921*y+0.501872413*z-0.338137333).^2;(-22.09773556*x+4.532201111*y-35.13106889*z+30.95699333).^2];

goal = [0,0,0];

weight = [1,1,1];

x0 = [1 1 1];

[x,fval,attainfactor,exitflag]= fgoalattain(funn,x0,goal,weight,[],[],[],[],[1 1 1],[1.1 1.1 1.1])

The error said that there is a failure in initial objective function evaluation.

Could anyone help me about this error? Much appreciated!

Best regards

Xu Li

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Answer 1

Riccardo Scorretti 2022-4-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1695585-failure-in-initial-objective-function-evaluation-in-fgoalattain#answer_941895

在 MATLAB Online 中打开

Hi Li,

the error is that funn requires three arguments, whereas fgoalattain needs a function with a single argument.

To fix the problem it is enough to rewrite x = x(1), y = x(2) and z = x(3):

% funn = @(x,y,z)[(0.42305*x+0.043383*y+0.16814*z-0.78716).^2;(-0.631363873*x-0.258982921*y+0.501872413*z-0.338137333).^2;(-22.09773556*x+4.532201111*y-35.13106889*z+30.95699333).^2];
funn = @(x)[(0.42305*x(1)+0.043383*x(2)+0.16814*x(3)-0.78716).^2;(-0.631363873*x(1)-0.258982921*x(2)+0.501872413*x(3)-0.338137333).^2;(-22.09773556*x(1)+4.532201111*x(2)-35.13106889*x(3)+30.95699333).^2];
goal = [0,0,0];
weight = [1,1,1];
x0 = [1 1 1];
[x,fval,attainfactor,exitflag]= fgoalattain(funn,x0,goal,weight,[],[],[],[],[1 1 1],[1.1 1.1 1.1])
Local minimum possible. Constraints satisfied.

fgoalattain stopped because the size of the current search direction is less than
twice the value of the step size tolerance and constraints are 
satisfied to within the value of the constraint tolerance.
x = 1×3
    1.0000    1.1000    1.0000
fval = 3×1
    0.0220
    0.5663
  453.1104
attainfactor = 453.1104
exitflag = 4