How to add a +1 to some of the numbers in a matrix

Hi

i have a matrix:

A = [1 2 3 4 5 6 7 8 9 10 11 12
    7 8 9 10 11 12 13 14 15 16 17 18
    13 14 15 16 17 18 19 20 21 22 23 24];

i want:

A = [1 2 3 4 5 6 7 8 9 10 11 12
    7 8 9 10 11 12+1 13+1 14+1 15+1 16+1 17+1 18+1
    13+1 14+1 15+1 16+1 17+1 18+1 19+1 20+1 21+1 22+1 23+1 24+1];

and then:

A = [1 2 3 4 5 6 7 8 9 10 11 12
    7 8 9 10 11 13 14 15 16 17 18 19+1
    14+1 15+1 16+1 17+1 18+1 19+1 20+1 21+1 22+1 23+1 24+1 25+1];

my a loop or something ?

[Adam]

What is the logic behind it? If there is none then you can just hard-code the maths as in Walter's answer.

Answer 1

[Walter Roberson]

A(2,6:end) = A(2,6:end) + 1;
A(2,end) = A(2,end) + 1; A(3,:) = A(3,:) + 1;