Python array, write a large array

Question

I have a 100*100 array in python and I used: f.open(file_name) and f.write(matrix_name) to write it in this file. Actually the matrix was written in the file but in this format:

[[ 1 1 1 1 1 1 1 1 1 1 1 1 1 1
   1 1 1 1 1 1 1 1 1 1 1 1 1 1
   1 1 1 1 1 1 1 1 1 1 1 8 91 1
   . 
   .
   .]
[  7 8 1 1 1 1 1 1 1 1 1 1 1 1 
   1 1 1 1 1 1 1 22 3 4  5 6  6
   .
   .
   .]
[  . 
   . 
   .
]]

so my problem that each row from the matrix was written in many rows in the file (e.g. row 1 was written in 17 rows in the file), because I need each row in the matrix printed in one row in the file.. so totally I need a 100 row in the file, not more than the 100 rows.

Are we talking about numpy arrays here? The numpy library has several options of writing data from an array to a file for you, rather than just dumping the text representation into a file. — Martijn Pieters
– Martijn Pieters, Commented Oct 16, 2014 at 11:56
My array (a) has a size 100*100 and I used f = open('dd.txt', 'w') f.write(str(a)), but when I opened the file, I found that each row (100 elements) is written in more than one row in the text file (formatting problem)... so I need each row in the matrix is shown in one row in the text file..(in other words: I want to make the line size more bigger when I write the matrix in the text) — Khaled
– Khaled, Commented Oct 16, 2014 at 12:05
Khaled, the fundamental question is whether this is a Numpy array. It certainly looks like it is, but only you can tell us. — Sven Marnach
– Sven Marnach, Commented Oct 16, 2014 at 12:07

Sven Marnach · Accepted Answer · 2014-10-16 12:09:27Z

1

To write a Numpy array to a text file, you can use numpy.savetxt() or the tofile() method of the array. The specifics depend on the output format you need. You should also consider using some binary format, which is more efficient to read and write.

answered Oct 16, 2014 at 12:09

Sven Marnach

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1 Comment

Mailerdaimon Over a year ago

@Khaled If this Answer is what you are looking for: Please consider Accepting it, so other user can see that your problem is solved! meta.stackexchange.com/questions/5234/…

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