How to replace a subsection in a 5 x 5 matrix with a 4 x 2 matrix

Question

Kendal 2022-11-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1843143-how-to-replace-a-subsection-in-a-5-x-5-matrix-with-a-4-x-2-matrix

回答： Voss 2022-11-4

I have a matrix: R55 = [2,4,6,9,11;7,8,9,10,6;1,2,6,4,5;,6,9,8,5,6;1,6,5,7,5];

I need to replace the subsection of elements starting from the element located on the 1st row and 3rd column, and ending at the element located on the 4th row and 4th column with all 1's and name it R55Mod.

I need to keep the original R55 matrix to perform further manipulations.

Thanks in advance!

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Answer 1

Voss 2022-11-4

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https://ww2.mathworks.cn/matlabcentral/answers/1843143-how-to-replace-a-subsection-in-a-5-x-5-matrix-with-a-4-x-2-matrix#answer_1090918

在 MATLAB Online 中打开

 R55 = [2,4,6,9,11;7,8,9,10,6;1,2,6,4,5;,6,9,8,5,6;1,6,5,7,5];
 
 R55Mod = R55;
 R55Mod(1:4,3:4) = 1
R55Mod = 5×5
     2     4     1     1    11
     7     8     1     1     6
     1     2     1     1     5
     6     9     1     1     6
     1     6     5     7     5