sum of function handles

Hi, i want to sum two function handle. the functions that i want to sum are following;

   f1=0;
     for i=1:20
          f2=f2(x(1),x(2),x(3))
          f1=f1+f2 
     end
how can i do by using function handle? the following is true?

 f1=@(x)(0);     
for i=1:20
  f2=@(x)(f2(x(1),x(2),x(3)))
  f1=@(x)(f1(x)+ f2(x));
end

Can anyone help me? Because i use this last summation function for fminsearch

[Jing]

Hi, I don't quite understand your functions. In the sum function(not function handle) you wrote, if f2 is a predefined function, it will be reassigned as an variable after first iteration and f1 is a double variable.

BTW, what is the for-loop used for?

[Jan]

@dert: Please do not cross post. Posting a question in several forums at the same time wastes the time of the voluntary helpers.

[Walter Roberson]

duplicates http://www.mathworks.co.uk/matlabcentral/answers/58916-sum-og-two-inline-function

Answer 1

[Thorsten]

Do you want to evaluate f2 20 times and store the summed result in f1? Than you can use this:

   f1 = 0;
   for i=1:20
     f1 = f1 + f2(x(1),x(2),x(3));
   end

Otherwise, please explain what you want to do.

Answer 2

[Umar Ceres]

So this thread is quite old and seems nobody has posted a method to sum function handles and have a resulting anonymous function. See the following:

a1 = @(x) x(1).^2 + x(2).^2;
a2 = @(x) x(1) + x(2);

syms x [1 2] matrix

a = a1(x) + a2(x)       

a = 

a_syms = symmatrix2sym(a)

a_syms = 

a_anon = matlabFunction(a_syms)

a_anon = function_handle with value:
    @(x1_1,x1_2)x1_1+x1_2+x1_1.^2+x1_2.^2

[Dyuman Joshi]

@Umar Ceres, How will you proceed with the same method if a1 and a2 are defined as follows -

a1 = @(x) sum(x(1:randi(numel(x))).^2);
a2 = @(x) sum(x(1:randi(numel(x))));