Computer Problems

if there is a given a matrix e.g 

A=[1 2 3; 4 5 6; 7 8 9; 10 11 12]

 if we want to remove fourth row then there is a specific command in MAT LAB with the help of which we can eliminate a row as well column :

    we normally represent a vector A(row,column) 
  A(1:3,1:3)  //1:3 represents First three row and same 1:3 represent first three column

ans =

     1     2     3
     4     5     6
     7     8     9

Another Method 

If you want to remove a specific row in any matrix then use this command
A(2,:)=[]         // if you want to remove nth row then use this command A(n,:)

A =

     1     2     3
     7     8     9
    10    11    12

Deletion Of Column In Mat lab

A=[1 2 3; 4 5 6; 7 8 9; 10 11 12]

Same here if we want to remove a column then same we use a same method. E.g if we want to remove a third column from a matrix then we use a command