What is the use of repmat in the following program?

Question

Pooja 2013-8-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84785-what-is-the-use-of-repmat-in-the-following-program

i=I;
[ir ic]=size(I);
if ir ~=512 && ic~=512
   I=repmat(I,[1 2]);
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jan 2013-8-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/84785-what-is-the-use-of-repmat-in-the-following-program#answer_94332

编辑：Jan 2013-8-15

在 MATLAB Online 中打开

If none of the dimensions of I equal 512 (for some reason) it is repeated and the copied matrix is added horizontally to I.

i.e. the following should produce the same output

if ~any( size(I)==512 )
   I=horzcat(I,I);
end

2 个评论
显示无隐藏无

Pooja 2013-8-15

By doing this will it affect the input image?Any data loss?

Jan 2013-8-15

As I said, the matrix I (or image if you will) will be duplicated and the results concatenated if none of the input dimensions equal "512". In that case, the code does affect the image - you end up with an image of double width where left half and right half are identical. Prior to this step a copy of the image is made (i=I;). No data will be lost.

Anyway, the action based on the condition in the if-statement does seem slightly weird to me. Are you sure the code makes sense in a broader scope?

请先登录，再进行评论。