How to merge function handles in matlab?
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Dina Irofti
le 29 Juil 2015
Commenté : Sean de Wolski
le 29 Juil 2015
Hi!
I have a function handle of this form:
fk = @(a, b, k) a+b+k;
I would like to obtain another function handle that is actually a vector where every element is the first function handle evaluated in k, for k between 1 and a given n.
f = @(a, b) [fk(a, b, 1) fk(a, b, 2) ... fk(a, b, n)]
Example: for n =3, I would like to obtain
f = @(a,b) [fk(a, b, 1) fk(a, b, 2) fk(a, b, 3)]
How can I do this?
P.S.: I would like something that looks like a for loop, that can work for every given n.
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Stephen23
le 29 Juil 2015
Modifié(e) : Stephen23
le 29 Juil 2015
fun = @(a,b,n) arrayfun(@(nn)fk(a,b,nn), 1:n);
2 commentaires
Guillaume
le 29 Juil 2015
Stephen's answer is just a more generic version of yours, and more importantly safer, if you're not aware of the closure behaviour of anonymous functions. Consider the result of
fk = @(a, b, k) a+b+k;
n = 2;
fun = @(a, b) arrayfun(@(k)fk(a,b,k),1:n); %your fun
fun(5, 6)
n = 5;
fun(5, 6) %for fun n is still 2
versus
fk = @(a, b, k) a+b+k;
fun = @(a, b, n) arrayfun(@(k)fk(a,b,k),1:n); %Stephen's fun
n = 2;
fun(5, 6, n)
n = 5;
fun(5, 6, n) %fun uses the new n
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Sean de Wolski
le 29 Juil 2015
You can store those function handles in a cell using a for-loop or just run the for-loop over the k values.
for ii = 1:10
Cfun{ii} = @(a,b)f(a,b,ii);
end
2 commentaires
Sean de Wolski
le 29 Juil 2015
They're actually equivalent, ii is a static copy of the integer that it is equal to at anonymous function creation, you can see its values by looking at the workspace values in functions:
q = 7
f = @(x)x*q
fv = functions(f)
fv.workspace{1}
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