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I'd like to save the contents of a numpy float array into a raw binary file as signed 16 bit integers. I tried to accomplish this using ndarray.tofile but I can't figure out the right format string. It seems that the file is saved in double format, mo matter how I choose the format string. How do I do this? Thanks.

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2 Answers

up vote 6 down vote accepted

I think the easiest way to do this is to first convert the array to int16,

array.astype('int16').tofile(filename)
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up vote 1 down vote

Take a look at the struct module, try this example:

import struct
import numpy

f=open("myfile","wb")
mydata=numpy.random.random(10)
print(mydata)
myfmt='f'*len(mydata)
#  You can use 'd' for double and < or > to force endinness
bin=struct.pack(myfmt,*mydata)
print(bin)
f.write(bin)
f.close()
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