How can I write a matrix into a tab delimited .dat file with header?

Hi,

I would like to ask you the following: I have a matrix (lets call it Output[]) with numbers (integ, decimal and bool) and I want to transform it into a tab delimited .dat file in a format that includes a *header *in the first line and also curly brackets in every row like the following:

Number of Output rows: 240 %this number will be actually assigned by the size of the matrix

{ 102 103 3.5 2.7 1 2.3 } %the spaces are actually tabs

{ 1223 305 8 9 3 0.5 }

{ 507 109 6.5 8.7 2 7.3 }

...and so on

Can somebody help me to do it with fprintf?

Thanks, Iro

Answer 1

[Walter Roberson]

fid = fopen('YourFile.dat', 'wt');

fprintf(fid, 'Number of Output rows: %d\n', size(Output,1));

fprintf(fid, '{\t%g\t%g\t%g\t%g\t%g\t%g\t}\n', Output.' );

fclose(fid);

Each \t represents a tab.

Notice the .' after Output. This is needed so that the output comes out by rows. (It works. Worry about why another time ;-) )

Answer 2

[Iro]

Hi Walter,

thank you for your answer. I understand the transpose to some extent but I do not get the dot. However it indeed worked! :)

What about the 'wt' instead of 'w' in fopen? Would that mean something in case I want to overwrite this file for each iteration of my code?

Thanks again,

Iro

[Walter Roberson]

'wt' means you are writing a text file, and is otherwise the same as 'w'.

.' is pure transpose, whereas ' without a dot is conjugate transpose