line count in text file

% linecount.m

% from https://uk.mathworks.com/matlabcentral/answers/81137-pre-determining-the-number-of-lines-in-a-text-file

% Answer by Walter Roberson on 10 Jan 2017

%

function n = linecount(filename)

[fid, msg] = fopen(filename);

if fid < 0

error('Failed to open file "%s" because "%s"', filename, msg);

end

n = 0;

while true

t = fgetl(fid);

if ~ischar(t)

break;

else

n = n + 1;

end

end

fclose(fid);