Matrix operation with equation

2014 1 29
1 个回答
更新时间：2021 8 20
2 次查看（30 天）

0 个投票

Hello, I have a equation:
X' = X + (0.7 * PN)
Where:
X = Matrix with size 2x2 as much as 64x4 (256)
PN = Matrix with size 1024x1
What should I do to get X', with the same shape and size with X?
Would you help me please?
Thankyou.

7 个评论
显示 5更早的评论 隐藏 5更早的评论

Iain
Iain 2014-1-29
Can you describe what that equation is trying to do?
José-Luis
José-Luis 2014-1-29
How do you intend to add matrices of different size? That is undefined behavior.
Andi Tarigan
Andi Tarigan 2014-1-29
I want to change the value of X by X' using the equation above, do I have to change the size of X in advance to make the size of X be equal to the size of the PN? Because it will be the same number of elements, that is 1024.
José-Luis
José-Luis 2014-1-29
Yes, they need to be of the same size to add them.
Iain
Iain 2014-1-29
They do need to be of the same size, but how you should do it depends on what you're trying to represent. For example, it could be that PN should be replaced by a some kind of subsampled version of PN to make it the same height as X, and then replicated to the same width as X, or it could be that X needs to be expanded to the same as PN.
José-Luis
José-Luis 2014-1-29
编辑：José-Luis 2014-1-29
Correction: they need to have the same number of elements, unless you are adding a scalar to a matrix.
Andi Tarigan
Andi Tarigan 2014-1-29
Can you help me to be able to work on this program as you say?

回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-1-29

0 个投票

If X' is the transpose of X, the only way that X and X' are the same size is when X is a square matrix

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Andi Tarigan
Andi Tarigan 2014-1-29
So I have to first change the size of X in order to be same with the PN? Because I should be able to also restore X' into the form of a 2x2 matrix, only it's value has changed.

此问题已关闭。

产品

标签

关闭：

MATLAB Answer Bot
MATLAB Answer Bot
2021-8-20

Community Treasure Hunt

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

Start Hunting!

Translated by