Saving numpy array to txt file row wise

Question

I have an numpy array of form  a    1 2 3    which I want to save to a  txt file such that the file looks like   1 2 3   If I use numpy savetxt then I get a file like   1 2 3   There should be a easy solution to this I suppose  any suggestions

User · Accepted Answer

If numpy  gt   1 5  you can do          note that the filename is enclosed with double quotes           example  filename txt    numpy savetxt  filename   a  newline        Edit  several 1D arrays with same length  a   numpy array  1 2 3   b   numpy array  4 5 6   numpy savetxt filename   a b   fmt   d      gives    1 2 3   4 5 6   several 1D arrays with variable length  a   numpy array  1 2 3   b   numpy array  4 5    with open filename  w   as f      f write   n  join     join map str  x   for x in  a b       gives    1 2 3   4 5

User · Answer

An alternative answer is to reshape the array so that it has dimensions  1  N  like so   savetext filename  a reshape 1  a shape 0

User · Answer

The numpy savetxt   method has several parameters which are worth noting      fmt   str or sequence of strs  optional    nbsp  nbsp  nbsp  nbsp it is used to format the numbers in the array  see the doc for details on formating      delimiter   str  optional    nbsp  nbsp  nbsp  nbsp String or character separating columns      newline   str  optional    nbsp  nbsp  nbsp  nbsp String or character separating lines    Let s take an example  I have an array of size  M  N   which consists of integer numbers in the range  0  255   To save the array row-wise and show it nicely  we can use the following code   import numpy as np  np savetxt  my array txt   my array  fmt   4d   delimiter      newline   n

User · Answer

import numpy a   numpy array  1 2 3    with open r test txt    w   as f      f write     join map str  a

User · Answer

import numpy as np  a    1 2 3      b   np array a  reshape  1 3       np savetxt  a txt  b fmt   d

User · Answer

I know this is old  but none of these answers solved the root problem of numpy not saving the array row-wise  I found that this one liner did the trick for me   b   np matrix a  np savetxt  file   b

User · Answer

I found that the first solution in the accepted answer to be problematic for cases where the newline character is still required  The easiest solution to the problem was doing this   numpy savetxt filename   a   delimiter   t

User · Answer

just      join a    and write this output to a file

User · Answer

Very very easy   1 2 3   A list is like a column    1 2 3   If you want a list like a row  double corchete     1  2  3    --- gt     1  2  3   and    1  2  3    4  5  6    --- gt  1  2  3                              4  5  6   Finally   np savetxt  file      r1c1    r1c2      r2c1    r2c2     delimiter      fmt   s     Note  the comma between square brackets  inner list are elements of the outer list

[python] Saving numpy array to txt file row wise

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