Argument to dynamic structure reference must evaluate to a valid field name.

V_c =2.*pi.*x10.((R-x9).^2 - x1.^2) + pi.*L.*(R.^2 - (R-x9).^2) +

pi.*x12.*((Ro+x6).^2 - (x1+x7).^2);

I am getting error in this that argument to dynamic structure reference must evaluate to a valid field name.

[Stephen23]

@Danishtah Quamar: please show us the complete error message. This means all of the red text.

[Danishtah Quamar]

Argument to dynamic structure reference must evaluate to a valid field name.

Error in objective_function (line 76)

V_c =2.*pi.*x10.((R-x9).^2 - x1.^2) + pi.*L.*(R.^2 - (R-x9).^2) + pi.*x12.*((Ro+x6).^2 - (x1+x7).^2);

Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)

fcn_handle = @(x) fcn(x,FcnArgs{:});

Error in gacon (line 23)

Iterate.f = FitnessFcn(Iterate.x');

Error in ga (line 405)

[x,fval,exitFlag,output,population,scores] = gacon(FitnessFcn,nvars, ...

Error in GA_mains (line 6)

[x,fval]=ga(objFcn,nvars,[],[],[],[],lb,ub,consFcn);

[Danishtah Quamar]

these are errors

[Danishtah Quamar]

Yes that was only problem in coding.

Answer 1

[Star Strider]

Typographical error.

The single . is generating the error.

V_c =2.*pi.*x10.((R-x9).^2 - x1.^2) + pi.*L.*(R.^2 - (R-x9).^2) + pi.*x12.*((Ro+x6).^2 - (x1+x7).^2);
                ↑ ← MISSING OPERATOR

See if:

V_c =2.*pi.*x10.*((R-x9).^2 - x1.^2) + pi.*L.*(R.^2 - (R-x9).^2) + pi.*x12.*((Ro+x6).^2 - (x1+x7).^2);

works. (I do not see any other problems.)

.