How can I make an array of handles?

Hey,

Let's say I have a vector x=[1 2 3 4 5] (I don't know what's in it and the size its size is something I don't know in advance), And I want to make an array of handles which will, let's say, make the following:

f(i) = @(y) 3*x(i)+5*y;

How can I make it? (I'm using Matlab)

This is just a simple function but it will be the same principle I guess.

Thanks!

Answer 1

[Star Strider]

Using bsxfun:

f = @(x,y) 3*x + 5*y;                           % ‘Parent’ Function
ary = @(x,y) bsxfun(f, x(:), y(:)');            % Create Virtual Function Array

x = [1 2 3 4 5];                                % ‘x’ — Can Be Anything
y = randi(9, 1, 3);                             % ‘y’ — Can Be Anything

Result = ary(x, y);                             % Example Use

Answer 2

[the cyclist]

Use a cell array:

x = [3 4 5];
i = 2;

f{i} = @(y) 3*x(i)+5*y;

Notice the curly brackets on the left-hand side of the assignment.

[Roy Elbaz]

Ok thanks. Is there a way to do it in one action instead of going over all of x components? And if now, is there a way to pre-define the array so I won't enlarge it in every 'for' interval?

Answer 3

[Kaushik Lakshminarasimhan]

You don't need an array of handles to do that. You can use arrayfun like this:

x = 1:5;
y = 5;
z = arrayfun(@(x,y) 3*x + 5*y, x(:), repmat(y,length(x),1));