[kragen]

no, it is not, and i am not

discrete convolution is cₙ = Σᵢaᵢbₙ₋ᵢ

there is no way in which the indexes into the input matrices in a matrix multiplication are formed from sums or differences of indices and dummy variables

however, convolution is a matrix multiplication, specifically multiplication by the circulant matrix of the convolution kernel

hth, hand

[KRAKRISMOTT]

Sure it doesn't sum the whole matrix but it does sum row by row. Also how did you type out LaTeX in HN? Or is that a font?

[kragen]

it sums products, but convolution is summing products in a particular way that is not general matrix multipication

i typed special characters with the compose key; cf. https://github.com/kragen/xcompose

not as easy as latex but more compatible