sum in matlab coding
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what is the difference between
sum(a(1):a(3)) and sum(a(1:3))?
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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):a(3) % linear vector from 5 to 20 in steps of 1
a(1:3) % elements 1 through 3 of the vector a
sum(a(1):a(3))
sum(a(1:3))
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