How to export a structure to a text file?

Hello!

I used "importdata" to import the data inside a input.txt file, so I get a Structure which conatains: "data"(with numerical data) and "textdata"(with text data).

I would like to substitute the "data" matrix for another one with corrected values, and then export the complete structure again, to get a file with same format as input.txt with corrected numerical values.

Y tried to do it using dlmwrite, but eventhoug I specify the number of row (C) in which start pasting the numerical data, it erases the lines befoer C.

Any idea?

Thanks!

[Azzi Abdelmalek]

Can you give a short example of what you want to write in a text file?

[Lucia]

DATE 15.08.2013 USER Lucia

1 2 3 4 5 6 I get in "textdata" the first two rows with the header, and in "data" the matrix with the numbers. I would like to change the values in the matrix (in "data") and export again to a text file with same format as the former example.

[Lucia]

DATE 15.08.2013

USER Lucia

1 2 3 4 5 6

[Lucia]

What I would like to do is like "reverse" the "exportdata" function, to get a text file with the headers stored in "textdata" of the structure and the numerical values stored in "data" of the structure. Thanks.

Answer 1

[dpb]

There is no builtin functionality that will do that transparently, unfortunately. You'll have to build the new file

m = importdata(yourfile);
% mung on m.data here...
fid=fopen('new.txt','w');                   % open a new file for writing
for ix=1:length(m.textdata) 
  fprintf(fid,'%s\n',char(m(i).textdata));  % write the header lines
end
fprintf(fid,'%d ',m.data')                  % then the data
fid=fclose(fid);                            % close the new file..

type new.txt                                % see the new result...

You can overwrite the original file but that's dangerous unless you've thoroughly tested your script/function first, so better to write a new file then rename the old while getting started.

Again, afaik there's no total packaged function that will reproduce the above automagically -- seems like a logical extension but to this point "it ain't happened yet".