If a is a column vector and x is a column vector of length n, then
convmtx(a, n) * x
gives the convolution of of a and x and is the
same as conv(a, x). The difference is if
many vectors are to be convolved with the same vector, then
this technique is possibly faster.
Similarly, if a is a row vector and x is a row vector of length n, then
x * convmtx(a, n)
is the same as conv(x, a).
See also: conv.
Package: communications