MATLAB: How to obtain the absolute difference between elements in a row

absolute differencematrixrow

Hi I have

 a=  4     3     2     1
     4     3     1     2
     4     2     3     1

I want to know the absolute difference between elements for each of the rows which gives me

 b= 1 1 1
    1 2 1 
    2 1 2

How am I going to do this? Thank you.

b = abs(diff(a, 1, 2))

You can use the diff function:

if any(sum(abs(diff(a,1)),2)==0)
msgbox('hello')
end

Use ‘B’ to define the rows of ‘A’:

A=[1 10; 2 20; 3 30]; 
B=[3 1 2]';
Anew = A(B,:)
Anew =
     3    30
     1    10
     2    20