# Matrix to be printed to a text file

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Ionut Anghel on 23 Jun 2015
Edited: Stephen23 on 23 Jun 2015
Hi, I have the following matrix AA=[Nan 1 2 3 Nan 4 5 6 Nan 7 8 9 Nan 10 Nan Nan] I want to print this matrix to a file: myfile.txt the code looks like:
fid01 = fopen('mynewfile.txt', 'w'); fprintf(fid01, '%9.8E %9.8E %9.8E %9.8E\n', transpose(AA)); fclose('all');
As one can see, one has to use transpose function in order to print correct the matrix in myfile.txt. But because of Nan the following error occurs:
"Invalid file identifier. Use fopen to generate a valid file identifier." How can avoid this. I have to use NaN in my matrix in order to replace with blanks so in myfile.txt I should have
'' 1 2 3
'' 4 5 6
'' 7 8 9
'' 10 '' ''
The file will be huge [210000x4] ~ 20 MB.
Thank you
##### 2 CommentsShowHide 1 older comment
Ionut Anghel on 23 Jun 2015
Your answer works well My code is: AA=[Nan 1 2 3; Nan 4 5 6; Nan 7 8 9; Nan 10 Nan Nan]; fid01 = fopen('mynewfile.txt', 'w'); fprintf(fid01, '%9.8E %9.8E %9.8E %9.8E\n', transpose(AA)); fclose('all');
I dont't know what was wrong since if will have a number instead of NaN is working. The tricky question is now how can I replace NaN with blanks in the matrix and printed to mynewfile.txt. Thank you.
P.S. I want to accept your answer but because you put write it in the comments section does not work.

Stephen23 on 23 Jun 2015
Edited: Stephen23 on 23 Jun 2015
The problem are your NaN's, which you wrote as Nan, not NaN. Character case is important in MATLAB! Here with Nan:
>> AA = [Nan 1 2 3; Nan 4 5 6; Nan 7 8 9; Nan 10 Nan Nan];
Undefined function or variable 'Nan'.
With correct NaN, no error:
>> AA = [NaN 1 2 3; NaN 4 5 6; NaN 7 8 9; NaN 10 NaN NaN];

### More Answers (1)

Ingrid on 23 Jun 2015
the error that is given has nothing to do with the NaNs in your file but means that the file to were you want to write could not have been opened correctly. This would show as fid01 == -1
are you sure that you have writing permissions to were you want to write the file?
##### 1 CommentShowHide None
Ionut Anghel on 23 Jun 2015
Yes, I have permission. I'm creating this file. If I replace NaN with 0 or any other number is working very well.

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