Filling the matrix entries

Question

Teshome Kumsa 2022-5-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1727270-filling-the-matrix-entries

回答： Image Analyst 2022-5-25

I have a matrix to deal with.

A=[1 2 3 4 5 6 7;4 6 7 4 5 8 7; 6 7 8 9 3 5 6];
for i=1:3
    A(i,i)=0;
end

In the above simple code I could change A(i,i) by 0. Now I want to start from the last entry(A(3,7)) and change to 0 in the similar way. In simple way A(3,7), A(2,6,) and A(1,5) should be changed by zero. I need it in the loop I started.

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Answer 1

Image Analyst 2022-5-25

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Perhaps this:

A=[1 2 3 4 5 6 7;4 6 7 4 5 8 7; 6 7 8 9 3 5 6]
A = 3×7
     1     2     3     4     5     6     7
     4     6     7     4     5     8     7
     6     7     8     9     3     5     6
for k = 1 : 3
    A(k, k+4)=0;
end
A % Display result
A = 3×7
     1     2     3     4     0     6     7
     4     6     7     4     5     0     7
     6     7     8     9     3     5     0