Filling up a vector

Suppose I have 1 by 2N vector

x=zeros(1,2*N);

Now I have N of 1 by 2 vector

y1=ones(1,2), y2=ones(1,2)

and I want to fill x as

[y1 y2 ...]

what will be a compact way to fill x in this way (instead of concatenation)?

[Stephen23]

Do NOT do this! The MATLAB documentation specifically advises against what you are trying to do: "A frequent use of the eval function is to create sets of variables such as A1, A2, ..., An, but this approach does not use the array processing power of MATLAB and is not recommended. The preferred method is to store related data in a single array"

source: https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

Read this to know more:

http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Answer 1

[Walter Roberson]

x(1:2:end) = y1;
x(2:2:end) = y2;

or

x = reshape([y1; y2], 1, []);    %requires that y1 and y2 be row vectors

or

 x = reshape([y1(:), y2(:)].', 1, []);   %does not requires that they be row vectors

[alpedhuez]

But in reality, N is large and there are many y1, y2,...., y100 so that it cannot be brute force. Then what needs to be done?

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Though I see now that I misinterpreted your question -- I thought you wanted alternating elements, but instead you were looking for dynamic variable names.

[alpedhuez]

Let me think about it and phrase questions in a clearer way. Thank you.