deleting rows and columns

lets say if matrix K = [1 2 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16]

if i use:

           rows2remove=[1];        ....1
           cols2remove=[1];        ....2
           K(rows2remove,:)=[]     ....3
           K(:,cols2remove)=[]     ....4

           rows2remove=[4];        ....5
           cols2remove=[4];        ....6
           K(rows2remove,:)=[]     ....7
           K(:,cols2remove)=[]     ....8

at line 4, it removes the 1st row and 1st column of the matrix K. then, it gives an error ' Index of element to remove exceeds matrix dimensions'. that's because the new matrix is 3 by 3 after executing the line 4. how do i delete 1st row 1st column and then 4th row 4th column of original matrix K?

i could have used

           rows2remove=[1 4];       
           cols2remove=[1 4];        
           K(rows2remove,:)=[]     
           K(:,cols2remove)=[]

but how can i delete the row-column pair individually? what i mean is i would like to 'delete 1st row 1st column' so that i get a 3 by 3 matrix. then the next operation 'deleting 4th row 4th column' from the original matrix K so that finally i get a required 2 by 2 matrix [6 7; 10 11]?

i hope you understand my question. it's bit confusing i guess.

Answer 1

[Azzi Abdelmalek]

K = [1 2 3 4; 5 6 7 8; 9 10 11 12; 13 14 15 16]
nr=1;
nc=1;
K(nr,:)=[]
K(:,nc)=[]
nr1=4;
nc1=4;
K(nr1-1,:)=[];
K(:,nc1-1)=[]

[ankur]

wow! Thank you very much Azzi. It works.