how to collect the numerical values of marginal areas in an array????(help immediately)

i have matrix of (n * m) i need to collect its numerical values located at its margin(1st row, `1st column, last row and last column). em not geting how to give its size

 {
for i = 1:1:n
 for j= 1:1:m
  ----------
  -----------
end
end}
   it takes all rows and columns of that perticular matrix. plz make its correction.

Answer 1

[Paulo Silva]

m is your array

FirstRow=m(1,:);
LastRow=m(end,:);
FirstColumn=m(:,1);
LastColumn=m(:,end);