[Numpy-discussion] ndarray.T2 for 2D transpose

Alan Isaac alan.isaac at gmail.com
Tue Apr 5 22:26:16 EDT 2016


On 4/5/2016 10:11 PM, Todd wrote:
> When you try to transpose a 1D array, it does nothing.  This is the
> correct behavior, since it transposing a 1D array is meaningless.
> However, this can often lead to unexpected errors since this is rarely
> what you want.  You can convert the array to 2D, using `np.atleast_2d`
> or `arr[None]`, but this makes simple linear algebra computations more
> difficult.
>
> I propose adding an argument to transpose, perhaps called `expand` or
> `expanddim`, which if `True` (it is `False` by default) will force the
> array to be at least 2D.  A shortcut property, `ndarray.T2`, would be
> the same as `ndarray.transpose(True)`.



Use `dot`.  E.g.,
         m.dot(a)

hth,
Alan Isaac






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