how to turn elements in matrix to 0?

Question

Kobi 2014-10-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/157884-how-to-turn-elements-in-matrix-to-0

编辑： José-Luis 2014-10-8

i have this matrix:

arround this shape the elements are close to zero (in a small values for example: xe-20-xe-10) is there a simple way to take the elements only around this shape and change them into zero?

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Kobi 2014-10-8

i tried to do this in this way but i don't understand what is wrong

[col,row]=find(abs(diag(T))<0.2); T(row,col)=0;

i'm expecting to zero only a square around the shape in this way

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Chad Greene 2014-10-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/157884-how-to-turn-elements-in-matrix-to-0#answer_154431

在 MATLAB Online 中打开

If you'd like to change all values in T that are less than some threshold (we'll call the threshold thresh), all you need is

T(T<thresh)=0;

2 个评论
显示无隐藏无

Kobi 2014-10-8

not for all the values only for a square of zeros i managed to do this in a way that i don't really like i create a threshold for the diognal values of the matrix and take 10% from the scale

treshold=(max(max(abs(diag(T))))-min(min(abs(diag(T)))))*0.1; ind=find(abs(diag(T))<treshold);

but i don't like this because i need to set the threshold manually

any suggestions?

José-Luis 2014-10-8

编辑：José-Luis 2014-10-8

Well, a threshold is subjective, even when applying complex statistical methods. You are going to have to select something. Even if you use a function, the choice is subjective.

I guess what I am trying to ask is how do you want to set that limit?

请先登录，再进行评论。