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Setting Quantity item inconsistent #2959

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Setting Quantity item inconsistent#2959
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units

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@wkerzendorf
wkerzendorf
opened on Sep 19, 2014

As expected

In [42]: test = np.arange(1000) * u.km

In [43]: test[300] = 1000
ERROR: UnitsError: '' (dimensionless) and 'km' (length) are not convertible [astropy.units.quantity]

UnitsError: '' (dimensionless) and 'km' (length) are not convertible

but

In [44]: test[300] = 0.0

In [45]: test[300]
Out[45]: <Quantity 0.0 km>

@mhvk any ideas?

Activity

  1. astrofrog commented on Sep 19, 2014

    @astrofrog
    astrofrog
    on Sep 19, 2014
    Member

    @wkerzendorf - I think this is intentional behavior, in the sense that 0 is pretty unambiguous - it doesn't matter what unit system it's in (with the exception of celsius/fahrenheit), 0 m is the same as 0 km etc. It doesn't mean we can't decide to change it, but I'm pretty sure this is intentional, not a bug.

  2. astrofrog
    added
    units
    on Sep 19, 2014

  3. mdboom commented on Sep 19, 2014

    @mdboom
    mdboom
    on Sep 19, 2014
    Contributor

    The relevant PR is #1254.

  4. mdboom
    closed this as completedon Sep 19, 2014
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