[Numpy-discussion] Error in allclose with inf values

Matthew Brett matthew.brett@gmail....
Sun Aug 19 06:57:50 CDT 2007


Hi again,

> I noticed that allclose does not always behave correctly for arrays with infs.

Sorry, perhaps I should have been more specific; this is the behavior
of allclose that I was referring to (documented in the tests I
attached):

In [6]:N.allclose([N.inf, 1, 2], [10, 10, N.inf])
Out[6]:array([ True], dtype=bool)

In [7]:N.allclose([N.inf, N.inf, N.inf], [10, 10, N.inf])
Warning: invalid value encountered in subtract
Out[7]:True

In [9]:N.allclose([N.inf, N.inf], [10, 10])
---------------------------------------------------------------------------
exceptions.AttributeError                            Traceback (most
recent call last)

/home/mb312/<ipython console>

/home/mb312/lib/python2.4/site-packages/numpy/core/numeric.py in
allclose(a, b, rtol, atol)
    843     d3 = (x[xinf] == y[yinf])
    844     d4 = (~xinf & ~yinf)
--> 845     if d3.size < 2:
    846         if d3.size==0:
    847             return False

AttributeError: 'bool' object has no attribute 'size'


Matthew


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