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numpy and cython

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  numpy and cython pauld11718 <pauld11718@gmail.com> - 2015-05-09 07:51 -0700
    Re: numpy and cython Chris Angelico <rosuav@gmail.com> - 2015-05-10 01:04 +1000
      Re: numpy and cython pauld11718 <pauld11718@gmail.com> - 2015-05-09 08:56 -0700
        Re: numpy and cython pauld11718 <pauld11718@gmail.com> - 2015-05-09 09:09 -0700
          Re: numpy and cython Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-09 17:54 +0100
        Re: numpy and cython Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-09 17:53 +0100

#90234 — numpy and cython

Unable to compile :

import numpy as np
cimport numpy as np
import math as m

DTYPE = np.float
ctypedef np.float_t DTYPE_t

def visc1(float t, float dcal):
    cdef float h, tr, trinv, rhor
    cdef float eta0, sumi, i, sumj, im1, jm1, eta
   
    cdef np.ndarray vb = np.array([1.00000, 0.940695, 0.578377, -0.202044], dtype = DTYPE)
   
    cdef np.ndarray[DTYPE_t, ndim=2] va = np.array([[.4864192, .3509007, -.2847572, .07013759,.0164122, -.01163815,.0],
        [-.2448372,1.315436, -1.037026, .4660127, -.02884911,-.008239587,.0],
        [-.8702035, 1.297752, -1.287846, .2292075, .0,  .0, .0],
        [.8716056, 1.353448,  .0,  -.4857462, .1607171,.0,    -.003886659],
        [-1.051126, .0,   .0,   .0,   .0,      .0,   .0],
        [.3458395, .0,  -.02148229, .0, -.009603846, .004559914,.0]], dtype=DTYPE, ndim = 2)
   

    h=55.2651e-06;
    tr = t/643.89;
    trinv=643.89/t;
    rhor=dcal/0.358;

    eta0 = h*(m.pow(tr,0.5))/(vb[0] + vb[1]/tr + vb[2]/(tr*tr) + vb[3]/(tr**3));
    sumi=0.0
    for i in range(6):
        sumj=va[i,0]
        for j in range(2,7):
            jm1=j-1;
            sumj=sumj+va[i,j]*((rhor-1.0)**jm1);
           
        im1 = i-1
        sumi = sumi+sumj*((trinv-1.0)**im1);
       
    eta = eta0*m.exp(rhor*sumi)
    return eta

Error :
Compiling visco.pyx because it changed.
Cythonizing visco.pyx
running build_ext
building 'visco' extension
gcc -pthread -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/home/deepraj/miniconda3/envs/venv1/include/python3.4m -c visco.c -o build/temp.linux-x86_64-3.4/visco.o
In file included from /usr/include/numpy/ndarraytypes.h:1761:0,
                 from /usr/include/numpy/ndarrayobject.h:17,
                 from /usr/include/numpy/arrayobject.h:4,
                 from visco.c:258:
/usr/include/numpy/npy_1_7_deprecated_api.h:15:2: warning: #warning "Using deprecated NumPy API, disable it by " "#defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-Wcpp]
 #warning "Using deprecated NumPy API, disable it by " \
  ^
gcc -pthread -shared build/temp.linux-x86_64-3.4/visco.o -L/home/abcd/miniconda3/envs/venv1/lib -lpython3.4m -o /media/abcd/Man_UTD/pythoncode/venv1/visco.cpython-34m.so

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#90235

On Sun, May 10, 2015 at 12:51 AM, pauld11718 <pauld11718@gmail.com> wrote:
> Unable to compile :
> /usr/include/numpy/npy_1_7_deprecated_api.h:15:2: warning: #warning "Using deprecated NumPy API, disable it by " "#defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-Wcpp]
>  #warning "Using deprecated NumPy API, disable it by " \
>   ^
> gcc -pthread -shared build/temp.linux-x86_64-3.4/visco.o -L/home/abcd/miniconda3/envs/venv1/lib -lpython3.4m -o /media/abcd/Man_UTD/pythoncode/venv1/visco.cpython-34m.so

Looks like a warning to me. Are you sure the compilation isn't
working? Check to see if you have an output file. If you don't,
there's something else wrong, not just this.

ChrisA

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#90238

NO the compilation isn't working...

The setup.py : 

from distutils.core import setup
from Cython.Build import cythonize

setup(
    ext_modules = cythonize("visco.pyx")
)

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#90239

An interesting observation : 

Any simple program with just :

cimport numpy as np 

doesnot compile.

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#90240

On 09/05/2015 17:09, pauld11718 wrote:
> An interesting observation :
>
> Any simple program with just :
>
> cimport numpy as np
>
> doesnot compile.
>

Fascinating.  What has this got to do with the general election results 
from the UK?  Or is there some other context that you're not prepared to 
let us in on?

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence

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#90242

On 09/05/2015 16:56, pauld11718 wrote:
> NO the compilation isn't working...
>
> The setup.py :
>
> from distutils.core import setup
> from Cython.Build import cythonize
>
> setup(
>      ext_modules = cythonize("visco.pyx")
> )
>

If you cannot be bothered to supply any context so I've no idea what 
you're talking about, then I cannot be bothered to try and help.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence

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