MATLAB: How to insert elements to get a new output

MATLAB

i have a character variable with elements such as
cv = '000001010011100101111'
vect = [1 2 3];
Now i want to insert the vect elements to cv after every 3 elements. So that i get
new_cv = '0001001201030111100210131111'
for understandability i insert space after 3 elements
cv = '000 001 010 011 100 101 111'
new_cv = '000 1 001 2 010 3 011 1 100 2 101 3 111 1'
The elements of vect is repeated till the length of cv

Best Answer

cv = '000001010011100101111'
vect = [1 2 3];
groupsize = 3;  
assert(mod(numel(cv), groupsize) == 0, 'Input cannot be divided evenly into groups of %d elements', groupsize);
prefix = reshape(cv, groupsize, []);  %reshape input into columns of groupsize elements
postfix = char(repmat(vect + '0', 1, ceil(size(prefix, 2)/groupsize)));  %replicate vect to be at least as long as prefix, and convert to char
postfix = postfix(1:size(prefix, 2));  %truncate unneeded elements
result = reshape([prefix; postfix], 1, [])  %concatenate and reshape into one row
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