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8

Is there a way to dump a NumPy array into a CSV file? I have a 2D NumPy array and need to dump it in human-readable format.

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2 Answers 2

up vote 129 down vote accepted 
import numpy
a = numpy.asarray([ [1,2,3], [4,5,6], [7,8,9] ])
numpy.savetxt("foo.csv", a, delimiter=",")
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is this preferred over looping through the array by dimension? I'm guessing so. –  Ehtesh Choudhury May 21 '11 at 10:13
    
The array is an ndarray. I hope it adds up. –  Dexter May 21 '11 at 16:53
1  
It did. Thanks! –  Dexter May 22 '11 at 11:00
13  
you can also change the format of each figure with the fmt keyword. default is '%.18e', this can be hard to read, you can use '%.3e' so only 3 decimals are shown. –  Andrea Zonca May 22 '11 at 17:25
1  
Andrea, Yes I used %10.5f. It was pretty convenient. –  Dexter May 23 '11 at 9:47
up vote 6 down vote

savetxt may just be sufficient.

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