[Numpy-discussion] matrix problem: float to matrix power
Wed Oct 31 12:01:15 CDT 2007
Charles R Harris wrote:
> On 10/31/07, Alan G Isaac <firstname.lastname@example.org> wrote:
>> array([ 1., 1., 1.])
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in <module>
>> TypeError: unsupported operand type(s) for ** or pow(): 'float' and 'matrix'
>> Why the restriction for matrices?
> Looks like it just got overlooked. It works fine for 2D arrays.
> In : 1.0**eye(3)
> array([[ 1., 1., 1.],
> [ 1., 1., 1.],
> [ 1., 1., 1.]])
For ndarrays, it does elementwise exponentiation, so it is neither here nor
there with respect to matrices. What is the definition of a scalar raised to a
matrix power? I don't ever recall seeing one.
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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