How to go one line before in a while loop ?

Hello everyone,

I wonder if we can go back one line before during a while loop? Here is the code to understand better my question:

while ~feof(fileID)                               
tline = fgetl(fileID);                    
    if (isempty(tline))  
    else              
        if ischar(tline)                        
            U = regexp(tline, ',ChipId,');
            if isfinite(U) == 1;                
                A=strsplit(tline,',');
                ChipID1.id=A{1};
% here I want to go one line before in my file that I read and collect the information of the previous line
B = strsplit("tline-1",',') % I know that I cannot write tline-1 to obtain what I want but this is the spirit                  
ChipID2.id= B{1};
            end

I know that tline is not a number of line and I cannot write "tline-1" to go back to previous line but how can I do it ???

Thank you very much for your help !!!

N0N0

Answer 1

[Thorsten]

Store the line before and use it if needed:

 tline = [];

 while ~feof(fileID)                               
   linebefore = tline;
   tline = fgetl(fileID);

[NoNo]

Thank you very much :)