Populate Every other Element of Array with Function Handle MATLAB

Question

I have the following function:

function F = farray (f,N)
F = {@(t) zeros(N,1)};
    for i=1:N
        if mod(i,2)==0
            F{i}=f(t);
        end
    end
F = cell2mat(F);
end

f is a function handle of time, that is f=@(t)f(t). N dictates the size of the output array F. Similar to f, F is also a function of time. I would like to populate every other entry of F with f, and return F as a function handle that converts to a double array when substituted for t. All other entries in the array should be zero. I thought what I have above would work, but that is not the case. Where am I going wrong here?

An array of functions is not the same as a function that returns an array. You want to write a function that evaluates y = f(t) and then returns an array that alternates 0 and y. Does this need to be an anonymous function or can you write a regular function? (Note that you can have a handle to any type of function!) — Cris Luengo
– Cris Luengo, Commented Apr 16, 2024 at 18:20
@CrisLuengo. I would like the latter, a function that returns an array. I am looking for an anonymous function that can be used for any value of t — Jonathan Frutschy
– Jonathan Frutschy, Commented Apr 16, 2024 at 18:33

Cris Luengo · Accepted Answer · 2024-04-16 18:50:25Z

1

I would do this this way: write a function that creates the desired output array for a given f, t and N, and then use an anonymous function to fill in the existing definitions of f and N so that you have a function only of t.

f = …
N = …
F = @(t) farray(f, t, N);

function out = farray (f, t, N)
    out = zeros(N,1);
    out(2:2:end) = f(t);
end

answered Apr 16, 2024 at 18:50

Cris Luengo

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1 Comment

Jonathan Frutschy Over a year ago

This works quite well. Thank you. @CrisLuengo

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