# convert two column matrices into one column matrix

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simith on 25 Mar 2018
Commented: simith on 25 Mar 2018
Hello I want to combine two column vector matrices into one column vector matrix like the example
A=[1;4;6;7;8]
B=[10;21;11;9]
C must be like:
C=[1;10;4;21;6;11;7;9;8]
I need a general answer because I have many and large columns. Thank you

Walter Roberson on 25 Mar 2018
nA = length(A);
nB = length(B);
C = zeros(nA + nB, 1);
nCommon = min(nA, nB);
C(1:2:nCommon*2-1) = A(1:nCommon);
C(2:2:nCommon*2) = B(1:nCommon);
if nA < nB
C(nCommon*2+1:end) = B(nCommon+1:end);
elseif nA > nB
C(nCommon*2+1:end) = A(nCommon+1:end);
%if the lengths were the same then everything was copied by the common processing
end
simith on 25 Mar 2018
thank you very much..it worked proprely

Roger Stafford on 25 Mar 2018
In the example you gave do this:
C = zeros(9,1);
C(1:2:end) = A;
C(2:2:end) = B;
For a general answer you need to define the generality you are seeking. Give us more information. For example, if the numbers in two vectors differs by more than one element, what do you wish as a result?
simith on 25 Mar 2018