You can add a condition to check if the current line is not empty before processing it. This should handle the case where you have blank lines in the input file.
textline1 = ' Z N E';
% First mixed data%
if index==0
index = strcmp(tline, textline1); %%Z N E
if index == 1; index = 1; end
elseif index == 1
% Check if the current line is not empty
if ~isempty(strtrim(tline))
tmp = sscanf(tline, '%f %f %f %f');
tmp1 = [tmp(3); tmp(2); tmp(1)]; % rearrange to E=X N=Y Z=Z
Output = [Output; tmp1'];
end
end
