How can I make the difference or subtraction between two scalar vectors?

Hello every one

I have vectors like

x1=[1 2 5 8 ]

x2=[2 1 0 6]

x1 - x2 = [5 8]

How can I get this result

if I do ; it will be [5 8 ] U [0] = [5 8 0] ???? also its problem

and do we choose value from vector or zero like:

rand([1 2 5 8 ], null) = 1 , then my new vector is [5 8 0 1]

Thank you

Answer 1

[Stephen23]

x1 = [1,2,5,8];
x2 = [2,1,0,6];
setdiff(x1,x2)

ans = 1×2

5 8

https://www.mathworks.com/help/matlab/set-operations.html

"and do we choose value from vector or zero like"

It is not clear exactly what you want to achieve, but probably indexing is crucial:

https://www.mathworks.com/help/matlab/math/matrix-indexing.html

For example:

N = numel(x1);
x3 = x1(randperm(N));
x3(randi(N)) = 0

x3 = 1×4

5 8 0 1

[Mira le]

Thank you very mush for your answer, My goal to to generate another vector according to x1 and x2