How to delete the last rows and columns?

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Omar B. le 21 Fév 2020

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https://fr.mathworks.com/matlabcentral/answers/506734-how-to-delete-the-last-rows-and-columns

Commenté : Adam le 21 Fév 2020

How to delete the last three rows and three columns from the following matrix without change N and then multiply the last off diagonal by 6?

then how can we store the new matrix?

M = zeros(N,N);
>> M(  1:1+N:N*N) = a;
>> M(N+1:1+N:N*N) = b;
>> M(  2:1+N:N*N-N) = c
M =
  -1   4   0   0   0   0   0   0   0   0
   2  -1   4   0   0   0   0   0   0   0
   0   2  -1   4   0   0   0   0   0   0
   0   0   2  -1   4   0   0   0   0   0
   0   0   0   2  -1   4   0   0   0   0
   0   0   0   0   2  -1   4   0   0   0
   0   0   0   0   0   2  -1   4   0   0
   0   0   0   0   0   0   2  -1   4   0
   0   0   0   0   0   0   0   2  -1   4
   0   0   0   0   0   0   0   0   2  -1