The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: sum of function handles
Replies: 2   Last Post: Jan 16, 2013 11:46 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Steven Lord

Posts: 18,038
Registered: 12/7/04
Re: sum of function handles
Posted: Jan 16, 2013 11:46 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"dert " <> wrote in message
> 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

One way to do it:

functionsTBE = cell(1, 5);
testvalue = 0;
for k = 1:5
functionsTBE{k} = @(x) sin(k*x);
testvalue = testvalue + functionsTBE{k}(3);
f = @(x) sum(cellfun(@(y) y(x), functionsTBE));
f(3) % Should match testvalue

Alternately, if your expressions aren't too complicated and you have
Symbolic Math Toolbox, write your functions as symbolic expressions, add
them, then use matlabFunction to convert the sum into a function.

Steve Lord
To contact Technical Support use the Contact Us link on

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.