清空筛选条件
清空筛选条件

Getting a j x k Matrix from j and k-dimensional Vectors Without a For Loop?

1 次查看（过去 30 天）
Mark Rzewnicki
Mark Rzewnicki 2020-3-23
编辑： per isakson 2020-3-24
Suppose I have two column vectors:
J = j x 1 vector
K = k x 1 vector
And I want to create a j x k matrix, W:
W = j x k matrix
where the columns of W are formed by multiplying the corresponding element of K by the vector J.
The for loop to create W looks like this :
% J = j x 1 vector
% K = k x 1 vector
W = zeros(length(J),length(K));
for i = 1:1:length(K)
W(:,i) = K(i)*J;
end
Numerical example:
J = [1 2 3]';
K = [4 5]';
should result in
W =
4 5
8 10
12 15
Is there any way I can avoid the for loop here? Thanks!

请先登录，再回答此问题。

采纳的回答

per isakson
per isakson 2020-3-23
编辑：per isakson 2020-3-24
See Matrix multiplication
>> J*K'
ans =
4 5
8 10
12 15

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

产品


版本

R2019a

Community Treasure Hunt

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

Start Hunting!

Translated by