getting data from an array correctly

Hi, I have the following data that I get it from the socket

header = [53 0 1 2 3 4 5 6 7 8 9 53 1 24 59 5 95 95 53 2 59 58 575 75 53 0 1 4 2 4 9 1];

The header first starts with 53, then maybe 0 or 1 or 2. so I need to get the bytes after 53 + 0 till the next 53 ( in between) and also get the data after 53 + 1 till the next 53 and so on

I tried that but it crashes

header = [53 0 1 2 3 4 5 6 7 8 9 53 1 24 59 5 95 95 53 2 59 58 575 75 53 0];
where = find(header == 53);
if numel(where) > 1 && header(where(1)+1) == 1 % check if there are more then 1 53s and number after first 53 is 0.
  nextbytes = header(where(1)+2:where(2)-1);
  disp(nextbytes);

   end

[Walter Roberson]

If the data itself included a 53, then how would that be coded?

What do you want to do in the case of a 53 followed by something that is not a 0, 1, or 2 ?

[Ahmed Tolba]

just ignore it if the 53 is followed by something other 0,1,2

[dpb]

Is it possibly data, though, even if not new record marker?

A formal description of the protocol would be more beneficial, methinks.

[Ahmed Tolba]

the protocal always start with 53 then its followed by 0 or 1 or 2 or 3, then it continues adding bytes after 53 1,2,3.. so its like header 53 and which ADC signal which is 0,1,2,3

Answer 1

[Walter Roberson]

where = [find(header(1:end-1)==53 & ismember(header(2:end), [0 1 2 3])), length(header)+1];
lengths = diff(where);
bytesplits = mat2cell(header(where(1):end), 1, lengths);

bytesplits is now a cell array in which each entry is a vector starting with an appropriate header.

[Ahmed Tolba]

Thanks, how to get the bytesplits, like the first section from 53 0 xxxx 53 1 xxx

[Ahmed Tolba]

I mean convert bytesplits into vectors so that I can plot them

[Walter Roberson]

for K = 1 : length(bytesplits)
  plot(bytesplits{K}(3:end), 'DisplayName', sprintf('#%d', K));
  hold on
end
hold off
legend('show');