How to subtract only certain elements of a vector

6 views (last 30 days)
If I have two vectors of the same length, is it possible to subtract only certain elements?
a = [1 4 6 7; 3 4 5 6]
b = [4 2 7 8; 2 6 7 8]
normally I would do:
a(1,:) - b(1,:)
But how do I the same subtraction but only with elements 1,2 and 4?
Is this possible to do? Which element I want to skip will change each time through my loop.
Thanks

Accepted Answer

John D'Errico
John D'Errico on 5 May 2022
a and b are not vectors in your question, they are arrays.
However, if you want to do this, nothing stops you from selecting the elements you wish to subtract, and do so.
a = [1 4 6 7; 3 4 5 6];
b = [4 2 7 8; 2 6 7 8];
ind = [1 2 4];
c = a(1,ind) - b(1,ind);
c
c = 1×3
-3 2 -1

More Answers (0)

Categories

Find more on Startup and Shutdown in Help Center and File Exchange

Products


Release

R2021b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!