Calculation with elements in row before or after

Hello MATLAB Community,

I'm searching for a elegant way to calculate with matrix-elements in different rows (or columns).

For example:

a=  [1 2 3 4 5; 6 7 8 9 0];

b should be a function of a row before, e.g. b=a[Row1] + [Value of Row 2].

The result would also be

b=
7   9   11  13  5
6   7   8   9   0

Or with columns e.g. b=a[Col1] + [Value of Col 2]

b=
3   5   7   9   5
13  15  17  9   0

Does anybody have a hint for me?

Very best

Christian

[Bruno Luong]

OP's answer moves here:

Thank you guys very much, that solved my problem.

You rock!

Answer 1

[Bruno Luong]

>> a=  [1 2 3 4 5; 6 7 8 9 0];
>> a

a =

     1     2     3     4     5
     6     7     8     9     0

>> conv2(a,[1;1],'same')

ans =

     7     9    11    13     5
     6     7     8     9     0

>> conv2(a,[1,1],'same')

ans =

     3     5     7     9     5
    13    15    17     9     0

If you want to do other operation that @plus, use your element-wise function on

a;
arownext = [a(2:end,:); zeros(1,size(a,2))];

a + arownext % replace + with your function

or

a;
acolnext = [a(:,2:end), zeros(size(a,1),1)];

a + acolnext % replace + with your function