How to add a number to an element of a vector which meets a certain criteria?

I have a vector which has sleep times. Its length is 915. But just for an example lets say,

t=[21.33; 22.45; 23.11; 23.67; 0.13; 1.56; 2.33];

The last 3 elements are times after midnight. So I want to add 24 to times after midnight. How can I do it? I tried using if statement.

if t<5

t=t+24

end

but this doesn't work.

Answer 1

[Star Strider]

This works:

t=[21.33; 22.45; 23.11; 23.67; 0.13; 1.56; 2.33];
t(t<5) = t(t<5)+24

t =
    21.33
    22.45
    23.11
    23.67
    24.13
    25.56
    26.33

This approach uses ‘logical indexing’ to specifically address only the elements you want. (Using decimal notation for the time makes this much easier!)

[Pree]

Thank you.

[Star Strider]

My pleasure.