sum in matlab coding

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ali hassan
ali hassan on 12 Feb 2022
Edited: DGM on 12 Feb 2022
what is the difference between
sum(a(1):a(3)) and sum(a(1:3))?

Accepted Answer

DGM
DGM on 12 Feb 2022
Edited: DGM on 12 Feb 2022
The first case is summing a linear increasing series between two values stored in a vector. The second is the sum of a subvector within a vector.
a = [5 -10 15 -20]
a = 1×4
5 -10 15 -20
a(1):a(3) % linear vector from 5 to 20 in steps of 1
ans = 1×11
5 6 7 8 9 10 11 12 13 14 15
a(1:3) % elements 1 through 3 of the vector a
ans = 1×3
5 -10 15
sum(a(1):a(3))
ans = 110
sum(a(1:3))
ans = 10

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