How add field to a import structure file *.txt.?

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Hello fellows I have a problem I need to add a field to a import text file.
I have some field's in a .txt file i need to use , but I need to add a new fields to structure, can someone help me with this?
Thanks in advance
fileID = fopen(fullfile( FilePath, FileName),"r");
%RELOAD FILE DATA IN MATRIX FORMAT WITH ALL COLUMNS
dataAcquisition = readmatrix(fullfile(FilePath,FileName),'NumHeaderLines',headerLine);
%CHOOSE THE COLUMN's WITH THE DATA NEEDED
ixKeep=[1 2:7]
%LOAD ALL REQUIRED FIELDS
dataAcquisition = dataAcquisition(:,ixKeep);
%%%%%%%%%%%%%ADD STRUCTURE WITH A FOLLOWING FIELDS%%%%%%%%%%%%%%
%SAMPLE | TIMESAMPLE | ECG | RESPIRATORY | TEMPERATURE | BATTERY
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
validFields = {'sample', 'time_aquisition', 'ecg', 'respiratory', 'temperature', 'baterry'}
  2 Comments
Biza Ferreira
Biza Ferreira on 24 Sep 2022
Once the "dataAquisition" variable represent a import file matrix, from *.txt file, i need associate each field of the following array (validFields), to each column of INPUT.txt file.
In the first column i need made a count eac sample until reache the total of samples(this to garant all samples are readed).
On de second column whant increment each sample time aquisition that is preformed at each 0.008s( t= 1/fs).
can anyone give me some support?
Thanks in advance

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