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How to save a list as numpy array in python?

I need to know if it is possible to save a python list as a numPy array.

If you look here, it might tell you what you need to know.

http://www.scipy.org/Tentative_NumPy_Tutorial#head-d3f8e5fe9b903f3c3b2a5c0dfceb60d71602cf93

Basically, you can create an array from a sequence.

import numpy as np
a = np.array( [2,3,4] )

Or from a sequence of sequences.

import numpy as np
a = np.array( [[2,3,4], [3,4,5]] )
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    • I would have put that syntax a little differently. How about import numpy as np then a = np.array ( [[2,3,4],[3,4,5]] ) ?

I suppose, you mean converting a list into a numpy array? Then,

import numpy as np

# b is some list, then ...    
a = np.array(b).reshape(lengthDim0, lengthDim1);

gives you a as an array of list b in the shape given in reshape.

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Here is a more complete example:

import csv
import numpy as np

with open('filename','rb') as csvfile:
     cdl = list( csv.reader(csvfile,delimiter='\t'))
     print "Number of records = " + str(len(cdl))

#then later

npcdl = np.array(cdl)

Hope this helps!!

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