Concatenating vectors based on list of variable names

I have 5 column vectors in my workspace with the same length, and a cell array with their names in the order that I would like to horizontally concatenate them in. In this example I use 5 vectors, but there can be more.

a1 = rand(5,1);
a10 = rand(5,1);
a11 = rand(5,1);
a2 = rand(5,1);
a3 = rand(5,1);
order = {'a1', 'a2', 'a3', 'a10', 'a11'};

How can I horizontally concatenate the variables in this order, such that I have the following result?

[a1, a2, a3, a10, a11]

[Stephen23]

https://www.mathworks.com/matlabcentral/discussions/tips/849901-tutorial-why-variables-should-not-be-named-dynamically-eval

Answer 1

[BobH]

c = cellfun(@eval, order, 'un', 0);
r = vertcat( c{:} );  
% horzcat if that's what you wanted, and all variables in order are same size

vertical concatenation looks like this (semicolons not commas)

[a1; a2; a3; a10; a11]

[Jerki Jokne]

Sorry, I meant horizontally. I edited the question to be consistent.

Answer 2

[Sriram Tadavarty]

Hi Jerki,

This can be done with a for loop as shown below:

out  =[]
for i = 1:numel(order)
    out = [out eval(order{i})];
end

Hope this helps.

Regards,

Sriram