tab delimited .txt file

Question

ricco 2011-11-18

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回答： Adam Danz 2020-6-17

In order to write a matrix as a tab delimited .txt file I can use the following command:

dlmwrite(Filename, Data, 'delimiter', '\t');

Say that the dimensions of 'Data' is [m n], how is it possible to include a non numeric vector (i.e. vector containing words) as m(1) in order to state what each colummn refers to in the .txt file?

thanks

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Answer 1

Grzegorz Knor 2011-11-18

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Suppose that your Data is:

Data = [1 2 3;4 5 6; 7 8 9];

Would you like to create such a file?

line1 1 2 3
line2 4 5 6
line3 7 8 9

If so, this is my suggestion:

Data = [1 2 3;4 5 6; 7 8 9];
names = {'line1','line2','line3'};
fid = fopen('test_file','w');
for k=1:3
   fprintf(fid,'%s\t%.2f\t%.2f\t%.2f\n',names{k},Data(k,:));
end
fclose(fid);

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ricco 2011-11-19

thanks that works perfectly. How would this code be altered if I needed the format of the .txt file to have the header on the top of each column of the matrix not on each row?

Paul Safier 2019-3-27

What if the data matrix had more than a few columns, say thousands? Would you have to type a format (e.g. .2f\t%) for each column?

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Answer 2

Walter Roberson 2011-11-18

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dlmwrite() can only be used for numeric data or for pure character data (an ugly hack with little purpose). dlmwrite() cannot be used for mixing character data and numeric data.

Grzegorz's proposed code looks fine.