[SciPy-user] installation problems on Mac OS X

[David M. Cooke]

On Jul 5, 2007, at 09:25 , Giovanni Samaey wrote:

> Hi all,
>
> I am trying to install scipy on my shiny new macbook:
> I followed instructions as on www.scipy.org/Installing_SciPy/ 
> Mac_OS_X/.
> Installation of vecLib was done when the computer shipped (I found a
> vecLib).  The link to the vecLib on the instruction page is dead and
> I couldn't find a download on apple.com, so I don't know if that
> installation is complete, as the instructions ask.

vecLib ships with OS X, so you don't need to install it (vecLib  
itself may be deprecated, I think it's suggested to use the  
Accelerate framework, which includes vecLib as a subframework). I  
think the page is wrong; it's part of the OS, not of the Developer  
Tools.

> Installation goes smoothly, byt scipy.test() gives 2 errors.  I tried
> both  python 2.4.4 and python 2.5.1; no difference. I have the most
> recent gfortran and I use gcc 4.0.   Scipy is taken from svn.
>
> ======================================================================
> FAIL: check_dot (scipy.lib.tests.test_blas.test_fblas1_simple)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>    File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
> python2.4/site-packages/scipy/lib/blas/tests/test_blas.py", line 76,
> in check_dot
>      assert_almost_equal(f([3j,-4,3-4j],[2,3,1]),-9+2j)
>    File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
> python2.4/site-packages/numpy/testing/utils.py", line 156, in
> assert_almost_equal
>      assert round(abs(desired - actual),decimal) == 0, msg
> AssertionError:
> Items are not equal:
>   ACTUAL: 3.4625784615075479e-37j
>   DESIRED: (-9+2j)
>
> ======================================================================
> FAIL: check_dot (scipy.linalg.tests.test_blas.test_fblas1_simple)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>    File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
> python2.4/site-packages/scipy/linalg/tests/test_blas.py", line 75, in
> check_dot
>      assert_almost_equal(f([3j,-4,3-4j],[2,3,1]),-9+2j)
>    File "/Library/Frameworks/Python.framework/Versions/2.4/lib/
> python2.4/site-packages/numpy/testing/utils.py", line 156, in
> assert_almost_equal
>      assert round(abs(desired - actual),decimal) == 0, msg
> AssertionError:
> Items are not equal:
>   ACTUAL: 3.4782945282523978e-37j
>   DESIRED: (-9+2j)
>
> ----------------------------------------------------------------------
> Ran 1632 tests in 3.592s
>
> FAILED (failures=2)

Don't worry, I get these too. There's a bug there, but no one's been  
bothered enough to find it. I doubt it'll impact you unless you call  
those wrapped BLAS routines directly.

-- 
|>|\/|<
/------------------------------------------------------------------\
|David M. Cooke              http://arbutus.physics.mcmaster.ca/dmc/
|cookedm at physics.mcmaster.ca