removing columns and rows from very large matrix

I have a very large (4000x4000) matrix. How might I remove a full row or column from the matrix? I need to remove 58 rows and columns, so that I end up with a 3942x3942 matrix.

[dpb]

Just define which rows/columns are to be deleted...or vice versa just save the ones do want...

Simplest w/o knowing any better would be

M(1:58,:)=[];  % remove first 58 rows
M(:,1:59)=[]:  % then first 58 columns

alternatively,

N=58;                               % put the constant in variable so can change
M=M(N+1:end,N+1:end);               % save rest besides first N rows,cols

Indexing vectors can be any set of indices desired, don't have to be contiguous or at beginning/end...

Answer 1

[Prasad Reddy]

% Generally we can choose which rows and columns to be deleated. Or we can chose which columns

% and rows to be present. create two vectors one for rows and another for columns of which you want in your answer

%you may use colen(:) operator if you have continues numbers.

%the same procedure can be chosen for deleting.

c=rand(6,6)
d=c([1,3,4,5],[3,4,5])
e=c([1,3:5],[3:5])