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/
from numpy import * a = zeros([2, 3], int) print(a) savetxt("/tmp/test1.txt", a, fmt='%8i') # Work around for adding the index. a[0] = range(3) print(a) savetxt("/tmp/test2.txt", a, fmt='%8i')
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