sum of multiplication for a vector and matrix

26 次查看（过去 30 天）
Abbi Hashem
Abbi Hashem 2019-6-27
编辑： Bruno Luong 2019-6-27
Say I have the following matrix and vector:
A = [ 2,3; 1,4] b= [ 5 , 7 ]
I want a code of the sum of the multiplication, such that each element of the matrix's first row are multiplied by the 1st cell of the vector, and the elements of the matrix's second row are multiplied by the 2nd cell of the vector, as follows:
2*5+3*5+1*7+4*7
( I will need this for a 1000*1000 matrix and a 1*1000 vector, but i used this example to clarify )

请先登录，再回答此问题。

回答（2 个）

James Tursa
James Tursa 2019-6-27
result = sum(b*A);
Bruno Luong
Bruno Luong 2019-6-27
编辑：Bruno Luong 2019-6-27
b*sum(A,2)
Less operations than the first solution.

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by