[Numpy-discussion] f2py with int8
Paul Anton Letnes
paul.anton.letnes at gmail.com
Tue Apr 17 12:12:34 EDT 2012
Ah, come to think of it, I think that f2py only supports literal kind values. Maybe that's your problem.
Paul
On 17. apr. 2012, at 07:58, Sameer Grover wrote:
> On Tuesday 17 April 2012 11:02 AM, John Mitchell wrote:
>> Hi,
>>
>> I am using f2py to pass a numpy array of type numpy.int8 to fortran. It seems like I am misunderstanding something because I just can't make it work.
>>
>> Here is what I am doing.
>>
>> PYTHON
>> b=numpy.array(numpy.zeros(shape=(10,),dtype=numpy.int8),order='F')
>> b[0]=1
>> b[2]=1
>> b[3]=1
>> b
>> array([1, 0, 1, 1, 0, 0, 0, 0, 0, 0], dtype=int8)
>>
>>
>>
>> FORTRAN
>> subroutine print_bit_array(bits,n)
>> use iso_fortran_env
>> integer,intent(in)::n
>> integer(kind=int8),intent(in),dimension(n)::bits
>> print*,'bits = ',bits
>> end subroutine print_bit_array
>>
>>
>> RESULT when calling fortran from python
>> bits = 1 0 0 0 0 0 0 0 1 0
>>
>> Any Ideas?
>> thanks,
>> John
>>
>>
>>
>>
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> It seems to work if "integer(kind=int8)" is replaced with "integer(8)" or "integer(1)". Don't know why, though.
>
> Sameer
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