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changing specific values in diagonal

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A Aln
A Aln 2019-3-25
关闭： MATLAB Answer Bot 2021-8-20
Hello,
I'm trying to change the values in the diagonal based on its column.
let says this is my matrix ( 1/ ,2/ ,3/ ,4/ . . . . are the rows and columns number)
1/ 2/ 3/ 4/ 5/ 6/ 7/ 8/ 9/ 10/ 11/ 12/
1/ 1 1 0 0 1 0 0 0 0 0 0 0
2/ 1 1 1 0 0 1 0 0 0 0 0 0
3/ 0 1 1 1 0 0 1 0 0 0 0 0
4/ 0 0 1 1 0 0 0 1 0 0 0 0
5/ 1 0 0 0 1 1 0 0 1 0 0 0
6/ 0 1 0 0 1 1 1 0 0 1 0 0
7/ 0 0 1 0 0 1 1 1 0 0 1 0
8/ 0 0 0 1 0 0 1 1 0 0 0 1
9/ 0 0 0 0 1 0 0 0 1 1 0 0
10/ 0 0 0 0 0 1 0 0 1 1 1 0
11/ 0 0 0 0 0 0 1 0 0 1 1 1
12/ 0 0 0 0 0 0 0 1 0 0 1 1
in Diag (XX,-1), I want to change those values to 999:
1/ 2/ 3/ 4/ 5/ 6/ 7/ 8/ 9/ 10/ 11/ 12/
1/ 1 1 0 0 1 0 0 0 0 0 0 0
2/ 999 1 1 0 0 1 0 0 0 0 0 0
3/ 0 1 1 1 0 0 1 0 0 0 0 0
4/ 0 0 1 1 0 0 0 1 0 0 0 0
5/ 1 0 0 0 1 1 0 0 1 0 0 0
6/ 0 1 0 0 999 1 1 0 0 1 0 0
7/ 0 0 1 0 0 1 1 1 0 0 1 0
8/ 0 0 0 1 0 0 1 1 0 0 0 1
9/ 0 0 0 0 1 0 0 0 1 1 0 0
10/ 0 0 0 0 0 1 0 0 999 1 1 0
11/ 0 0 0 0 0 0 1 0 0 1 1 1
12/ 0 0 0 0 0 0 0 1 0 0 1 1
How to know which column to change ?
I defined those varibles:
x = 4
y = 3
I should change those:
column 1
column x+1
column 2x+1
The required:
How to do it? are there any different way to make it automatic for any matrix size?
  4 个评论
显示 2更早的评论
KALYAN ACHARJYA
KALYAN ACHARJYA 2019-3-26
mat=[1 1 0 0 1 0 0 0 0 0 0 0;1 1 1 0 0 1 0 0 0 0 0 0;
0 1 1 1 0 0 1 0 0 0 0 0;0 0 1 1 0 0 0 1 0 0 0 0;
1 0 0 0 1 1 0 0 1 0 0 0;0 1 0 0 1 1 1 0 0 1 0 0;
0 0 1 0 0 1 1 1 0 0 1 0;0 0 0 1 0 0 1 1 0 0 0 1;
0 0 0 0 1 0 0 0 1 1 0 0;0 0 0 0 0 1 0 0 1 1 1 0;
0 0 0 0 0 0 1 0 0 1 1 1;0 0 0 0 0 0 0 1 0 0 1 1];
[rows colm]=size(mat);
r1=2:4:rows;
c1=1:4:colm;
mat(r1,c1)=999 % Modification needed for individual elementwise pair of r1 and c2

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回答（1 个）

Image Analyst
Image Analyst 2019-3-26
Sounds like homework. Some hints: check out toeplitz(), circshift(), and eye()

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