Re: [Gretl-devel] convolve function into extra?
On Tue, 19 Mar 2019, Allin Cottrell wrote:
On Tue, 19 Mar 2019, Sven Schreiber wrote:
> BTW, I think there are some typos in the notation in the Convolution
> paragraph: The sum indices i should start at 0, not 1, and the upper
> bound for the R(x) index should be p + q - 1 instead of pq-1.
I agree that the summation indices as stated do not seem to allow for a
constant term. One could either say
P(x) = \sum_{i=1}^p p_i x^{i-1}
for p = the degree of the polynomial + 1, or
P(x) = \sum_{i=0}^p p_i x^i
for p = the degree of the polynomial.
Notation can be a bugger, and not wanting to be excessively pedantic
here, but is it a problem in the cheatsheet exposition that 'p' is
implicitly used to refer to both an array of coefficients and the
length of that array?
Allin