[Numpy-discussion] f2py with int8

Paul Anton Letnes paul.anton.letnes@gmail....
Tue Apr 17 11:12:34 CDT 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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>> 
>> NumPy-Discussion@scipy.org
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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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