Subtracting in a structure

Hi, Sorry if some stuff doesnt make sense as I'm quite new to matlab!I have 1 x 229 struct array with 13 fields. One of the fields is a total number which adds up consecutively from a count.

Pass(NumPass).TotalPlayers = Count3

I'm trying to find a way to minus these numbers from each other so the difference is added to a SortedTotalPlayers field, so if the first 5 numbers in the TotalPlayers field were: 6,10,12,16,26, I would want the first 5 numbers in the SortedTotalPlayers field to be 6,4,2,4,10.

Pass(NumPass).SortedTotalPlayers = ?

I haven't realy got a clue what to put after the = sign, is this possible?

Thanks

Answer 1

[dpb]

Pass(NumPass).SortedTotalPlayers = diff[0 Pass(NumPass).SortedTotalPlayers];

Answer 2

[Stephen23]

You can do all of them at once using some comma-separated lists:

S(1).F = 6;
S(2).F = 10;
S(3).F = 12;
S(4).F = 16;
S(5).F = 26;
S.F % checking

ans = 6

ans = 10

ans = 12

ans = 16

ans = 26

C = num2cell(diff([0,S.F]));
[S.F] = C{:};
S.F % checking

ans = 6

ans = 4

ans = 2

ans = 4

ans = 10

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists

Answer 3

[Image Analyst]

Try this:

NumPass = 1;
Pass(NumPass).TotalPlayers = [6,10,12,16,26];
firstNumber = Pass(NumPass).TotalPlayers(1); % Get the "6"
Pass(NumPass).SortedTotalPlayers = [firstNumber, diff(Pass(NumPass).TotalPlayers)]

Pass = struct with fields:
          TotalPlayers: [6 10 12 16 26]
    SortedTotalPlayers: [6 4 2 4 10]