Always much better if you'll attach a section of the file for folks to work with...but try something like
file=readlines('yourfile.txt'); % read the file as string array
tlines=file(contains(file,'at time')); % extract the time step lines
t=str2double(extractBetween(tlines,'time',')')); % convert to time array
ix=find(contains(file,'resultants')); % find the stresses header lines
s=str2double(split(strip(file(ix+1)))); % convert to stresses array (one past header)
t=repmat(t,1,size(s,1)/numel(t)).'; % repeat t by number elements per time step
% following doesn't work -- see addendum/erratum below for fix...
tS=table(t(:),s,'VariableNames',{'Time',file(ix(1))}); % convert to table, make t column
Warning -- air code!! Salt to suit and beware of typos like mismatched parens, etc., ...
ADDENDUM: Patched and tested w/ sample file --dpb
ERRATUM: Excepting I didn't test the conversion to table all the way through -- the variable names won't work that way; it's not an array of strings but just one string -- sorry about that. The following code snippet will extract the names by finding where the end of each number is and backing up to the preceding...if the field width can be changed, this should deal with it...
s1=file(ix(1)+1); % save the stresses line as pattern to work from
iv2=find(s1{:}=='E')+3; % the end of each number field from the E+NN exponent
FL=diff(iv2); % the field width --
FL=[FL(1) FL] % presume first is same...
% split the first "resultants" record at the above points for table variable names
t1=strip(file(ix(1))); % the leading space is a problem because
t1=t1+blanks(strlength(s1)-strlength(t1)); % but have to have a line as long as numbers
vnames=strip(arrayfun(@(i1,i2)extractBetween(t1,i1,i2),iv2-FL+1,iv2,'uni',1));
array2table([t(:),s],'VariableNames',["Time" vnames]);
The file format is messed up -- unless was somehow corrupted in the posting...there's an offset of an extra column of the header for the two "moment-x" variables -- they go one character past the end of the numeric field column -- but, if add four instead of three to the index, then the line isn't long enough that way, either.
So, the above moves that line to parse left by one character by removing the leading blank and then padding it back onto the end...klunky, but needed to read the headers from the file instead of setting manually.
One could find the end of the column headings except they did you the favor of using an embedded blank in the last column so that's a hard one to deal with, too...
