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?

Answer 1

If numpy >= 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