Convert a function with 6 variables to a function with a vector of variables

i have problem in optimizing a function with 6 variables with fminunc this function is calculated in a separate mfile and its variables are symbolic. i used "matlabFunction' to convert symbolic variables to double and it is the result of converted function:

fht = @(X1,X2,X3,X4,X5,X6)X1.*(-7.816841030404245e17./3.602879701896397e16)-X2.*(2.903662166186983e17./9.007199254740992e15)-X3.*(2.473111021279802e18./7.205759403792794e16)-X4.*(3.154514183980667e18./1.441151880758559e17)-X5.*(3.784458384964962e18./1.441151880758559e17)-X6.*(1.558659168414693e18./7.205759403792794e16)+X5.*(X5.*(6.691230574683395e15./1.40737488355328e14)-5.793287589989213e31./2.028240960365167e31).*(5.621830876825228e18./5.764607523034235e17)+X3.*(X3.*(6.990230458976231e15./8.796093022208e12)-2.296952299100395e32./4.056481920730334e31).*(5.621830876825228e18./5.764607523034235e17)+X2.*(X2.*(4.351445659255419e15./7.0368744177664e13)-1.579619832936913e31./5.070602400912918e30).*(5.621830876825228e18./5.764607523034235e17)+X1.*(X1.*(5.635276523765723e15./1.40737488355328e14)-1.090492421236695e32./4.056481920730334e31).*(5.621830876825228e18./5.764607523034235e17)+X4.*(X4.*(8.329047667948217e15./1.40737488355328e14)-2.492204817037969e32./8.112963841460668e31).*(5.621830876825228e18./5.764607523034235e17)+X6.*(X6.*(4.656868418989877e15./5.62949953421312e14)-5.140807783280828e31./4.056481920730334e31).*(5.621830876825228e18./5.764607523034235e17)-3.493633073667787e15./3.602879701896397e16

i set appropriate values for x0 and then i used fminunc and this error appeared: Error using makeFhandle/@(X1,X2,X3,X4,X5,X6)X1.*(-7.816841030404245e17./3.602879701896397e16)-X2.*(2.903662166186983e17./9.007199254740992e15)-X3.*(2.473111021279802e18./7.205759403792794e16)-X4.*(3.154514183980667e18./1.441151880758559e17)-X5.*(3.784458384964962e18./1.441151880758559e17)-X6.*(1.558659168414693e18./7.205759403792794e16)+X5.*(X5.*(6.691230574683395e15./1.40737488355328e14)-5.793287589989213e31./2.028240960365167e31).*(5.621830876825228e18./5.764607523034235e17)+X3.*(X3.*(6.990230458976231e15./8.796093022208e12)-2.296952299100395e32./4.056481920730334e31).*(5.621830876825228e18./5.764607523034235e17)+X2.*(X2.*(4.351445659255419e15./7.0368744177664e13)-1.579619832936913e31./5.070602400912918e30).*(5.621830876825228e18./5.764607523034235e17)+X1.*(X1.*(5.635276523765723e15./1.40737488355328e14)-1.090492421236695e32./4.056481920730334e31).*(5.621830876825228e18./5.764607523034235e17)+X4.*(X4.*(8.329047667948217e15./1.40737488355328e14)-2.492204817037969e32./8.112963841460668e31).*(5.621830876825228e18./5.764607523034235e17)+X6.*(X6.*(4.656868418989877e15./5.62949953421312e14)-5.140807783280828e31./4.056481920730334e31).*(5.621830876825228e18./5.764607523034235e17)-3.493633073667787e15./3.602879701896397e16 Not enough input arguments.

Error in fminunc (line 250) f = feval(funfcn{3},x,varargin{:});

Error in gasifi (line 170( [xfinal fval exitflag output] = fminunc(fht,x0);

Caused by: Failure in initial user-supplied objective function evaluation. FMINUNC cannot continue.

as I learned fminunc only accepts function with a vector of variables like fth=@(x)..... i used X1=x(1) X2=x(2) X3=x(3) X4=x(4) X5=x(5) X6=x(6) to replace Xi with x(i) but i did not help and "fht" remained a function of(X1,X2,X3,X4,X5,X6).

i would be so thankful if anyone helps me to convert fht(X1,X2,X3,X4,X5,X6) to fht(x(

Answer 1

[James Tursa]

One way: Create an m-file function from your code and make a function handle to it. E.g.,

fht = @fht_fun

The file fht_fun.m:

function y = fht_fun(x)
X1 = x(1);
X2 = x(2);
X3 = x(3);
X4 = x(4);
X5 = x(5);
X6 = x(6);
y = X1.*(-7.816841030404245e17./3.602879701896397e16)-X2.*(2.903662166186983e17./9.007199254740992e15)-X3.*(2.473111021279802e18./7.205759403792794e16)-X4.*(3.154514183980667e18./1.441151880758559e17)-X5.*(3.784458384964962e18./1.441151880758559e17)-X6.*(1.558659168414693e18./7.205759403792794e16)+X5.*(X5.*(6.691230574683395e15./1.40737488355328e14)-5.793287589989213e31./2.028240960365167e31).*(5.621830876825228e18./5.764607523034235e17)+X3.*(X3.*(6.990230458976231e15./8.796093022208e12)-2.296952299100395e32./4.056481920730334e31).*(5.621830876825228e18./5.764607523034235e17)+X2.*(X2.*(4.351445659255419e15./7.0368744177664e13)-1.579619832936913e31./5.070602400912918e30).*(5.621830876825228e18./5.764607523034235e17)+X1.*(X1.*(5.635276523765723e15./1.40737488355328e14)-1.090492421236695e32./4.056481920730334e31).*(5.621830876825228e18./5.764607523034235e17)+X4.*(X4.*(8.329047667948217e15./1.40737488355328e14)-2.492204817037969e32./8.112963841460668e31).*(5.621830876825228e18./5.764607523034235e17)+X6.*(X6.*(4.656868418989877e15./5.62949953421312e14)-5.140807783280828e31./4.056481920730334e31).*(5.621830876825228e18./5.764607523034235e17)-3.493633073667787e15./3.602879701896397e16;
return
end

[mina k]

thanks James it helped me :)

Answer 2

[Alan Weiss]

FYI, you could also use the technique in this example.

Alan Weiss

MATLAB mathematical toolbox documentation