Second-order sections
Create or convert filter models to second-order sections form.
Sos(sos, g) as.Sos(x, ...) ## S3 method for class 'Arma' as.Sos(x, ...) ## S3 method for class 'Ma' as.Sos(x, ...) ## S3 method for class 'Sos' as.Sos(x, ...) ## S3 method for class 'Zpg' as.Sos(x, ...)
sos |
second-order sections representation of the model |
g |
overall gain factor |
x |
model to be converted. |
... |
additional arguments (ignored). |
as.Sos converts from other forms, including Arma, Ma,
and Zpg.
A list of class Sos with the following list elements:
second-order section representation of the model, returned as an
L x 6 matrix, one row for each section 1:L. Each row
consists of an [B, A], pair, where B = c(b0, b1, b2), and
A = c(1, a1, a2), the filer coefficients for each section. Each
b0 entry must be nonzero for each section.
overall gain factor that scales any one of the B_i vectors
Geert van Boxtel, G.J.M.vanBoxtel@gmail.com.
ba <- butter(3, 0.2) sos <- as.Sos(ba)
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