[Numpy-discussion] How to output array with indexes to a text file?
Paul Menzel
paulepanter@users.sourceforge....
Thu Aug 25 14:10:34 CDT 2011
Dear NumPy folks,
is there an easy way to also save the indexes of an array (columns, rows
or both) when outputting it to a text file. For saving an array to a
file I only found `savetxt()` [1] which does not seem to have such an
option. Adding indexes manually is doable but I would like to avoid
that.
--- minimal example (also attached) ---
from numpy import *
a = zeros([2, 3], int)
print(a)
savetxt("/tmp/test1.txt", a, fmt='%8i')
# Work around for adding the indexes for the columns.
a[0] = range(3)
print(a)
savetxt("/tmp/test2.txt", a, fmt='%8i')
--- minimal example ---
The output is the following.
$ python output-array.py
[[0 0 0]
[0 0 0]]
[[0 1 2]
[0 0 0]]
$ more /tmp/test*
::::::::::::::
/tmp/test1.txt
::::::::::::::
0 0 0
0 0 0
::::::::::::::
/tmp/test2.txt
::::::::::::::
0 1 2
0 0 0
Is there a way to accomplish that task without reserving the 0th row or
column to store the indexes?
I want to process these text files to produce graphs and MetaPost’s [2]
graph package needs these indexes. (I know about Matplotlib [3], but I
would like to use MetaPost.)
Thanks,
Paul
[1] http://docs.scipy.org/doc/numpy/reference/generated/numpy.savetxt.html
[2] http://wiki.contextgarden.net/MetaPost
[3] http://matplotlib.sourceforge.net/
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