Produce a matrix from pointwise outer product from vectors of different length

2 次查看（过去 30 天）
K.E.
K.E. 2016-8-27
编辑： Walter Roberson 2016-8-27
I have 3 by 1 vectors
u, v1, v2, v3.
I also have a 1 by 9 vector
v = [v1' v2' v3']
concatenating the conjugate of vi.
How can I produce a 3 by 9 matrix w such that
w = [u*v1' u*v2' u*v3'];
where
u*v1', u*v2', and u*v3'
are all 3 by 3.
  2 个评论
Walter Roberson
Walter Roberson 2016-8-27
You cannot. You have three sub-matrices each 3 x 3, for a total of 3 * 3 * 3 = 27 elements, but you want a 9 x 9 output matrix which calls for 9 * 9 = 81 elements. The content of the other 54 elements is not defined.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2016-8-27
编辑：Walter Roberson 2016-8-27
u * v
would be the same as
u * [v1', v2', v3']
which would be the same as
[u * v1', u*v2', u*v3']
so just go ahead and use u * v

更多回答（0 个）

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

Community Treasure Hunt

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

Start Hunting!

Translated by