Create a function handle sum of other function

Question

Pascal Denis 2022-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/1628725-create-a-function-handle-sum-of-other-function

评论： Pascal Denis 2022-1-14

采纳的回答： Rik

Hello everybody,

I try to create a function as sum of other functions, using data vectors of different size inside.

p = [0.1; 0.2; 0.3; 0.4] % p(i) is the weight associate

I get the from a Database a 4 x 6 parameter Matrix

C = [Data_11 Data_12 Data_13 Data_14 Data_15 Data_16
    ...
    Data_41 Data_42 Data_43 Data_44 Data_45 Data_46]; 

I'm using an external function : func_ext(x, C_par)

— x is a scalar

— C_Par a 1x6 vector

I would like to create the following function handle as an inline function :

, where A is a constant

Do you have an idea ?

Thanks for help.

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Stephen23 2022-1-14

It looks like the core of that is actually a basic matrix multiplication.

When you write that you " to create the following function" do you mean a function in the MATLAB sense (e.g. a function handle) or just an array of values?

Pascal Denis 2022-1-14

I'm mean function Handle not an array of values

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Answer 1

Rik 2022-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/1628725-create-a-function-handle-sum-of-other-function#answer_874455

Your anonymous function will become more opaque and I expect the performance to suffer, but this will work:

fun=@(x) A;
for i=1:size(p,1)
    fun=@(x) fun(x) + ... 
        p(i)*func_ext(x,C(i,:));
end

Although I would suggest using a different loop variable than i. You have the entire alphabet, so why use something that could be confused with sqrt(-1).