How can I sum the elements in a vector row without using the sum function or any form of loops?

How can I sum the elements in a vector row without using the sum function or any form of loops?

Answer 1

[per isakson]

This is one way

>> vec = (1:12);
>> vec*ones(12,1) % replace '12' by length(vec)
ans =
    78

and check if that's the correct result

>> sum(vec)
ans =
    78

[Stephen23]

+1 simple and precise

Answer 2

[Peng Li]

I don't quite understand your point about not using the function sum. But it is definitely possible to not use any form of loop.

suppose A is a matrix. sum(A) or sum(A, 1) calculates the sum along the first dimension (row). It gives the sum of each column, thus resulting you a row vector.

sum(A, 2) calculates the sum along the second dimension (column), thus throwing you a column vector with each element the sum of each row.