MATLAB: How to truncate specific rows and columns of matrix in matlab.

A = [10,20,30,40; ...
     20,30,40,50; ...
     30,40,50,60; ...
     40,50,60,70];

now i want to truncate the row no 2 and col no 2 and wants to get new matrix of 3×3? kindly help me

A(2,:)=[]
A(:,2)=[]

sqrt(bsxfun(@plus, column(:).^2, row.^2))

You will have to clear a row or a column completely

to remove row

 a=[1 2 3;4 5 6; 7 8 9]
 a(2,:)=[]    % remove 2nd row

to remove column

 a=[1 2 3;4 5 6; 7 8 9]
 a(:,2)=[]  % remove 2nd column

otherwise you need to convert them to NaN if removing individually

a=[1 2 3;4 5 6; 7 8 9]
a(2,2)=NaN   % convert 2nd row 2nd col to NaN