[Numpy-discussion] numpy.ma.flatnotmasked_contiguous error in slice.stop values?

Charles R Harris charlesr.harris@gmail....
Tue Aug 10 20:54:54 CDT 2010


Hi Pierre,

On Sun, Aug 8, 2010 at 8:47 PM, Pierre GM <pgmdevlist@gmail.com> wrote:

>
> On Aug 8, 2010, at 10:37 PM, Geordie McBain wrote:
>
> > The function numpy.ma.flatnotmasked_contiguous returns slices which
> > miss the last element; for example, based on the example at
> >
> http://docs.scipy.org/doc/numpy/reference/generated/numpy.ma.flatnotmasked_contiguous.html
> ,
>
> OK, mind opening a ticket ? I'll try to take care of that tmw and I don't
> want the bug report to fall between the cracks.
> >
> > which isn't really what we're after; I would have expected [3 4] and
> > [6 7 8]. Compare the similarly named
> > matplotlib.mlab.contiguous_regions which does have the expected
> > behaviour (although its output format is different)
>
> Oh, I didn't know there was such an option in mpl. I wonder when it got
> introduced...
>
> > import matplotlib.mlab
> > segments1 = matplotlib.mlab.contiguous_regions (am)
> > print 'contiguous_regions:', segments1
> > print am[slice (*segments1[0])], am[slice (*segments1[1])]
> >
> > which prints
> >
> > contiguous_regions: [(3, 5), (6, 9)]
>
> Mmh, tuples are nicer than slices... We'll see.
>
> > [3 4] [6 7 8]
> >
> > (I'm running Python 2.6.4 on 64-bit Linux Mint 8 `Helena', with NumPy
> > from Ubuntu Karmic, which I think means I have NumPy version 1.3.0?)
>
> print numpy.version.version
>
>
I'm getting these tests errors now.

======================================================================
FAIL: Test flatnotmasked_contiguous
----------------------------------------------------------------------
Traceback (most recent call last):
  File
"/usr/local/lib/python2.6/dist-packages/numpy/ma/tests/test_extras.py", line
104, in test_flatnotmasked_contiguous
    assert_equal(test, [])
  File "/usr/local/lib/python2.6/dist-packages/numpy/ma/testutils.py", line
98, in assert_equal
    raise AssertionError(msg)
AssertionError:
Items are not equal:
 ACTUAL: None
 DESIRED: []
>>  raise AssertionError('\nItems are not equal:\n ACTUAL: None\n DESIRED:
[]')


======================================================================
FAIL: Tests unmasked_edges
----------------------------------------------------------------------
Traceback (most recent call last):
  File
"/usr/local/lib/python2.6/dist-packages/numpy/ma/tests/test_extras.py", line
254, in test_edges
    assert_equal(test, [0, -1])
  File "/usr/local/lib/python2.6/dist-packages/numpy/ma/testutils.py", line
121, in assert_equal
    return assert_array_equal(actual, desired, err_msg)
  File "/usr/local/lib/python2.6/dist-packages/numpy/ma/testutils.py", line
193, in assert_array_equal
    header='Arrays are not equal')
  File "/usr/local/lib/python2.6/dist-packages/numpy/ma/testutils.py", line
186, in assert_array_compare
    verbose=verbose, header=header)
  File "/usr/local/lib/python2.6/dist-packages/numpy/testing/utils.py", line
618, in assert_array_compare
    raise AssertionError(msg)
AssertionError:
Arrays are not equal

(mismatch 50.0%)
 x: array([ 0, 24])
 y: array([ 0, -1])
>>  raise AssertionError('\nArrays are not equal\n\n(mismatch 50.0%)\n x:
array([ 0, 24])\n y: array([ 0, -1])')

Chuck
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