freqs | R Documentation |

Compute the s-plane frequency response of an ARMA model (IIR filter).

```
## Default S3 method:
freqs(filt = 1, a = 1, W, ...)
## S3 method for class 'Arma'
freqs(filt, ...)
## S3 method for class 'Ma'
freqs(filt, ...)
## S3 method for class 'freqs'
print(x, ...)
## S3 method for class 'freqs'
plot(x, ...)
## Default S3 method:
freqs_plot(w, h, ...)
## S3 method for class 'freqs'
freqs_plot(w, ...)
```

`filt` |
for the default case, the moving-average coefficients of
an ARMA model or filter. Generically, |

`a` |
the autoregressive (recursive) coefficients of an ARMA filter. |

`W` |
the frequencies at which to evaluate the model. |

`w` |
for the default case, the array of frequencies. Generically, |

`h` |
a complex array of frequency responses at the given frequencies. |

`x` |
object to be plotted. |

`...` |
additional arguments passed through to |

When results of `freqs`

are printed, `freqs_plot`

will be
called to display frequency plots of magnitude and phase. As with
`lattice`

plots, automatic printing does not work inside loops and
function calls, so explicit calls to `print`

are
needed there.

For `freqs`

list of class `freqs`

with items:

`H` |
array of frequencies. |

`W` |
complex array of frequency responses at those frequencies. |

Original Octave version by Julius O. Smith III. Conversion to R by Tom Short.

`filter`

, `Arma`

, `freqz`

```
b <- c(1, 2)
a <- c(1, 1)
w <- seq(0, 4, length=128)
freqs(b, a, w)
```

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