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

5 次查看（过去 30 天）
Keaton Winder
Keaton Winder 2020-3-26
评论： Stephen23 2020-3-26
How can I sum the elements in a vector row without using the sum function or any form of loops?

请先登录，再回答此问题。

回答（2 个）

per isakson
per isakson 2020-3-26
编辑：per isakson 2020-3-26
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
Peng Li
Peng Li 2020-3-26
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.

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

产品


版本

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by