Inserting space between values in vector

Hi,

Say I have a vector x = [1 2 3 4] How can I make it x1 = [1 0 2 0 3 0 4 0]

Thank you!!

Answer 1

[Wayne King]

Do you have the Signal Processing Toolbox?

 x = [1 2 3 4]; 
 x = upsample(x,2);

If not

    x = 1:4;
    y = zeros(2*length(x),1);
    y(1:2:end) = x;

If you have the Wavelet Toolbox

     x = 1:4;
     y = dyadup(x,0);

[Matt Fig]

I learn something new everyday. I didn't know there was a function to do this! Thanks, Wayne.

Answer 2

[per isakson]

One more way to do it

    x  = 1:4;
    x1 = cat( 1, x, zeros(size(x)) );
    x1 = transpose(x1(:));