How do I double the size of a vector in MATLAB with interpolation?

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You need to use interp1 with 'linear' interpolation method:

>> v = [1 2 3 4 10];
>> newNum = 13; % new number of elements in the "buffed" vector
>> iv = interp1( linspace(0,1,numel(v)), v, linspace(0,1,newNum) )
iv =
1.0000    1.3333    1.6667    2.0000    2.3333    2.6667    3.0000    3.3333    3.6667    4.0000    6.0000    8.0000   10.0000

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