将numpy数组写入文件

Question

I want to know if numpy has any build-in functions for writing to files or if there is a method, which should be used for writing an array constructed like this:

[[2, 3, 4], [3, 5, 6], [8, 7, 9]]

to a file so it looks like this:

2 3 4 
3 5 6
8 7 9

I am not sure how to this. I do know how to do it with a regular python list using a for loop but I want to know which way this should be done.

Answer 1

You can just use

np.savetxt( "filename.txt", your_array )

For details see: http://docs.scipy.org/doc/numpy-1.10.0/reference/generated/numpy.savetxt.html

[Update] You can use the formatting parameter eg like this:

your_array = [[2, 3, 4], [3, 5, 6], [8, 7, 9]]
np.savetxt("filename.txt", your_array, fmt="%d")