Matrix Question for 12*12 matrix

I have a 12*12 matrix and i want to convert it into 9*9 matrix by eleminating first two colum and first two row and also the forth colum and row, which will leave me a 9*9 matrix. i want to remove 1,2 and 4 column and row from 12*12 matrix?

Answer 1

[Alan Stevens]

Supposing M is the 12x12 matrix, then

M([1,2,4],:)=[];
M(:,[1,2,4])=[];

should remove the appropriate rows and columns.

[Nikhil Kelaginmath]

Thank you for your answer

i want to to use both the matrix but now i am getting M as 9*9, how to i name 9*9 a new matrix?

[Alan Stevens]

First set, say, N = M, then reduce N to 9x9.