Creating two vectors from one.
2 views (last 30 days)
Show older comments
Hi I have a vector;
x = [2 4;3 -8; 1 2; 2 4;]
I need to produce two vectors like the ones to the left and right below. To get the vector on the right it is x_r = [2*-8 3*2 1*4] and same process for left(x_l) the arrows show what needs to be multiplied by what.
If the number of rows (columns will always = two) increase or decrease or the numbers change I need to account for this. Is there a way where I can do this by vectorization or will I be stuck with loops.
Thanks,
0 Comments
Accepted Answer
Mischa Kim
on 26 Mar 2014
Edited: Mischa Kim
on 26 Mar 2014
Giuseppe, use
xr = x(1:end-1,1).*x(2:end,2)
xr =
-16
6
4
and equivalent for the other calculation.
More Answers (1)
Chandrasekhar
on 26 Mar 2014
x = [2 4;3 -8; 1 2; 2 4];
[m,n]=size(x);
for i= 1:m-1
a(i,1) = x(i,2)*x(i+1,1);
a(i,2) = x(i,1)*x(i+1,2);
end
See Also
Categories
Find more on Matrix Indexing in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!