> I can understand the desire to generalise the idea of matrix
> multiplication for when the arrays are not both 2-D but taking the
> complex conjugate makes absolutely no sense in the context of matrix
> multiplication.
>
> You note above that "vecmat is defined as x†A" but my interpretation
>
On Tue, 23 Jan 2024 at 23:13, Marten van Kerkwijk
wrote:
>
> >> I also note that for complex numbers, `vecmat` is defined as `x†A`,
> >> i.e., the complex conjugate of the vector is taken. This seems to be the
> >> standard and is what we used for `vecdot` too (`x†x`). However, it is
> >> *not*
>> I also note that for complex numbers, `vecmat` is defined as `x†A`,
>> i.e., the complex conjugate of the vector is taken. This seems to be the
>> standard and is what we used for `vecdot` too (`x†x`). However, it is
>> *not* what `matmul` does for vector-matrix or indeed vector-vector
>>
> For dot product I can convince myself this is a math definition thing and
> accept the
> conjugation. But for "vecmat" why the complex conjugate of the vector? Are we
> assuming that
> 1D things are always columns. I am also a bit lost on the difference of dot,
> vdot and vecdot.
>
> Also if
On Tue, 23 Jan 2024 at 22:18, Marten van Kerkwijk
wrote:
>
> I also note that for complex numbers, `vecmat` is defined as `x†A`,
> i.e., the complex conjugate of the vector is taken. This seems to be the
> standard and is what we used for `vecdot` too (`x†x`). However, it is
> *not* what `matmul`
For dot product I can convince myself this is a math definition thing and
accept the conjugation. But for "vecmat" why the complex conjugate of the
vector? Are we assuming that 1D things are always columns. I am also a bit
lost on the difference of dot, vdot and vecdot.
Also if __matmul__ and
Hi All,
I have a PR [1] that adds `np.matvec` and `np.vecmat` gufuncs for
matrix-vector and vector-matrix calculations, to add to plain
matrix-matrix multiplication with `np.matmul` and the inner vector
product with `np.vecdot`. They call BLAS where possible for speed.
I'd like to hear whether
