MATLAB: Sum elements of matrix aside from the first row or column

Question

I have a matrix

A=rand(10,40401);

How can i sum the elements of the matrix excluding

1.the first row only

2. the first column only.

Thanks.

Answer 1

A=rand(3,2)  % a short example for you to understand
a=A(2:end,:)  % excludes first row
b=A(:,2:end)  % excludes first column
a1=sum(a,1)  % sum across rows
%or
a2=sum(a,2)  % sum across columns
%same for b

Gives:

A =
    0.4037    0.2671
    0.1224    0.2462
    0.3660    0.3607
a =
    0.1224    0.2462
    0.3660    0.3607
b =
    0.2671
    0.2462
    0.3607
a1 =
    0.4884    0.6069
a2 =
    0.3686
    0.7268