MATLAB: Dlmwrite with two row header

dlmwriteMATLABsprintf

Hi, I am trying to use dlm write with two row header.(Datanames and headers) I made it for one row header. But For additional header it did not work? I could not write the second row header I would be pleased for any help.
% the data
     fnam='stop3.txt'; % <data file
     hdr={'Var_no','Acc','Dcc','Vcrs','Fcs','Vmax','Sure'}; % First header
     hdr2={'No','m/s2','m/s2','km/h','kg', 'm/s','s'}; % Second Header
     m=magic(7) %data
% the engine
     txt=sprintf('%s\t %s\r\t',hdr{:},hdr2{:});
     txt(end)='';
     dlmwrite(fnam,txt,'');
     dlmwrite(fnam,m,'-append','delimiter','\t');
% the result
     type(fnam)
The first row is ok. Bur for secodn row..It did not work. The data should be formatted like this as tab delimited txt file.
Var_No  Acc  Dcc  VCrs  FCs           Vmax          sure
No  m/s2  m/s2  km/h  kg            m/s          s
64  1,4  -2  40  0,145529778  11,46442127  50
50  1,2  -2  40  0,15172966  11,46151161  61
57  1,3  -2  40  0,151792581  11,49402332  60
36  1  -2  40  0,15426373  11,43154716  61
Kind Regards. Orkun ÖZENER

Best Answer

The creation of txt does not do, what you expect. Simply check the contents of this string:
disp(txt)
Suggestion:
   fmt = repmat('%s\t ', 1, length(hdr));
   fmt(end:end+1) = '\n';
   txt = sprintf(fmt, hdr{:},hdr2{:});
But then dlmwrite inserts an additional line break after the header. What about:
   fmt = repmat('%s\t ', 1, length(hdr));
   fmt(end:end+1) = '\n';
   fid = fopen(fnam, 'w');
   fprintf(fid, fmt, hdr{:});
   fprintf(fid, fmt, hdr2{:});
   fclose(fid);
   dlmwrite(fnam,m,'-append','delimiter','\t');
Why struggeling with the high-level and smart dlmwrite when you can write to the file directly?
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