Clear Filters
Clear Filters

How read in comment style to skip the header of a text file?

17 views (last 30 days)
I am trying to read hundreds of .dat file by skipping header lines (I do not know how many of them I need to skip beforehand). Header lines very from 1 to 20 and have at beginning either or "$" oder "!". A sample data (left column - node, right column - microstructure) has always two columns and looks like the following text file in the attachment.
I tried the following codeline, assuming I know beforehand that there 3 lines in header:
fid = fopen('Graphite_Node_Test.txt') ;
data = textscan(fid,'%f %f','HeaderLines',3) ;
How can I change the code so that it can read the .dat file without knowing the number of header lines beginning with either "$" or "!" sign?

Accepted Answer

Joseph Cheng
Joseph Cheng on 17 Jun 2021
Edited: Joseph Cheng on 17 Jun 2021
you can quickly scan the file(s) for the number of header lines like
file= 'Graphite_Node_test.txt';
fid = fopen('Graphite_Node_Test.txt') ;
hlines= 0;
while ~feof(fid)
cline =fgetl(fid); %get the current line
if strcmp(cline(1),'!') | strcmp(cline(1),'$') %check if it starts with ! or $
hlines = hlines+1; %if it does increment headerline counter
break %break out once past header
fseek(fid,0,-1); %rewind file to start
data = textscan(fid,'%f %f','Headerlines',hlines);

More Answers (0)


Find more on Data Import and Export in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!