Text file help.

How can I delete the end of the table to the end of the text file. Also how can I pull out the last number, in this case 91?

@89  A   0.009   0.988   0.004   0.004
@90  B   0.002   0.002   0.991   0.003
@91  C   0.002   0.003   0.004   0.989

Next line of text
erwerwerwererwerwer
ewrwerwerwerwe
werwerewrwe
werwerwerwe
werwerwer

Answer 1

[Jan]

FID = fopen(FileName, 'r');
if FID == -1; error('Cannot read file'); end
Data = textscan(FID, '%s', 'delimiter', '\n', 'whitespace', '');
fclose(FID);

CStr = Data{1};
startWith_at = strncmp(CStr, '@', 1);
last_at = find(startWith_at, 1, 'last');
last_number = sscanf(CStr{last_at}, '@%d');

% Delete trailing lines:
CStr(last_at + 1:end) = [];

Do you want to write the file afterwards?

FID = fopen(FileName, 'w');
if FID == -1; error('Cannot read file'); end
fprintf(FID, '%s\n', CStr{:});
fclose(FID);

Answer 2

[A]

read file line by line with tab separator; check for @ character; ignore or delete all strings that do not start with @.

hope it works