清空筛选条件
清空筛选条件

What does this mean in MATLAB?

7 次查看（过去 30 天）
med-sweng
med-sweng 2013-11-10
评论： the cyclist 2013-11-11
I have came about a MATLAB code like the following:
xyz = imfilter(A,B);
xyz_subsample = xyz(1:2:size(xyz, 1), 1:2:size(xyz, 2));
The code is related to subsampling. But, what does the second line mean?
Thanks.
  1 个评论
Jan
Jan 2013-11-10
@med-sweng: Your questions have a very low acceptance rate. This usually means, that there is a problem in the way you ask. In long term, this can discourage contributors to spend the time for answering your questions. So it is in your own interest to clarify your questions until they can be answered successfully, and accept this answer then.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

Jan
Jan 2013-11-10
编辑：Jan 2013-11-10
It crops every 2nd line and column out of the matrix xyz.
Simply try it:
xyz = randi(99, 10, 10)
xyzS = xyz(1:2:size(xyz, 1), 1:2:size(xyz, 2))
the cyclist
the cyclist 2013-11-10
Suppose xyz is a 256x512 matrix. Then
size(xyz,1)
is 256 and
size(xyz,2)
is 512.
The code
1:2:size(xyz,1)
is a vector counting by 2's:
[1 3 5 7 ... 255]
and likewise for the second dimension.
So, the whole code is subsampling by only selecting every 2nd element of both the x and y dimensions.
  2 个评论
med-sweng
med-sweng 2013-11-10
Thanks for your nice answer. So, the code will choose the following values from "x" for instance: 1, 3, 5, ..., 255, right?
the cyclist
the cyclist 2013-11-11
As Jan also describes, your code keeps rows 1,3,5,... and columns 1,3,5 ... .

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Logical 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