# how to Add two arrays representing integers base B--Test+function?

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Ekram Adam on 4 Sep 2017
Answered: Kris Fedorenko on 7 Sep 2017
Pseudo-Code: The variables are X, Y, Z, C which are all flipped arrays of proper size. This means that x₀ should be denoted X(1). 1.Add the two arrays X and Y and call it XpY element by element 2.for element i if XpY(i)> B-1, then XpY(i)=XpY(i)-B. Else do nothing. 3.If C=0 (every element is zero) then Z=XpY and I am done. Else X=XpY and Y=C, and repeat. X = [0, 6,6,6,6] ; Y = [0, 6,6,6,1]; % represents 6661 in base 7 B=7 ; [Z] = AddXYBaseB(X, Y, B) AddXYBaseB([6,6],[6,6],7)

Kris Fedorenko on 7 Sep 2017
Hi Ekram!
Element-wise addition of two vectors (of the same length) can be achieved simply by using the " + " operator in MATLAB. For example:
>> A = [ 1, 2, 3];
>> B = [ 1, 0, 5];
>> C = A+B
C =
2 2 8
For editing the XpY vector based on its values, consider examples in the following link: https://www.mathworks.com/help/matlab/matlab_prog/find-array-elements-that-meet-a-condition.html#bt_xjh4
For checking whether the vector contains all zeros, you can look into the " nnz " function.
You might also find MATLAB's conditional statements (if statements) and loops useful.
Hope this helps!
Kris

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