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How to add multiple values from column together

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link on 27 Jan 2021
Commented: Daniel Catton on 27 Jan 2021
Lets assume I have a vector a with n values
a = rand(n,1) % values
and I priovide another vector b containing some row indices of the vector above
b = [1 3 8 9 11 15 ..] % indices from vector a
How can I add the values from these rows together without using a loop?

Answers (1)

Daniel Catton
Daniel Catton on 27 Jan 2021
n = 10
a = rand(n,1);
b = sum(a);
  2 Comments
Daniel Catton
Daniel Catton on 27 Jan 2021
Oh I get you now, my bad. I thing you're going to struggle without using a loop. I can't think of a way without just coding the way a loop works. i.e:
a = rand(n,1); % values
b = [1 3 8 9 11 15 ..] % indices from vector a
a(b(1))+a(b(2))+a(b(3))+...

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