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How to add multiple values from column together

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link 2021-1-27
评论： Daniel Catton 2021-1-27
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?

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回答（1 个）

Daniel Catton
Daniel Catton 2021-1-27
n = 10
a = rand(n,1);
b = sum(a);
  2 个评论
link
link 2021-1-27
Hey, I do not want to add all values from, but only the values from the indices I provided in a second vector
Daniel Catton
Daniel Catton 2021-1-27
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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