Node:sysfreq, Next:cacsd, Previous:systime, Up:Control Theory
| frdemo () | Function File |
| Octave Control Toolbox demo: Frequency Response demo. |
| [mag, phase, w] = bode (sys, w, out_idx, in_idx) | Function File |
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If no output arguments are given: produce Bode plots of a system; otherwise,
compute the frequency response of a system data structure
Inputs
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| [wmin, wmax] = bode_bounds (zer, pol, dflg, tsam) | Function File |
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Get default range of frequencies based on cutoff frequencies of system
poles and zeros.
Frequency range is the interval
[10^wmin, 10^wmax]
Used internally in |
| freqchkw (w) | Function File |
Used by __freqresp__ to check that input frequency vector w
is valid.
Returns boolean value.
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| out = ltifr (a, b, w) | Function File |
| out = ltifr (sys, w) | Function File |
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Linear time invariant frequency response of single-input systems.
Inputs
-1
G(s) = (jw I-A) B
for complex frequencies s = jw.
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| [realp, imagp, w] = nyquist (sys, w, out_idx, in_idx, atol) | Function File |
| nyquist (sys, w, out_idx, in_idx, atol) | Function File |
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Produce Nyquist plots of a system; if no output arguments are given, Nyquist
plot is printed to the screen.
Compute the frequency response of a system. Inputs (pass as empty to get default values)
If no output arguments are given, nyquist plots the results to the screen. If atol != 0 and asymptotes are detected then the user is asked interactively if they wish to zoom in (remove asymptotes) Descriptive labels are automatically placed. Note: if the requested plot is for an MIMO system, a warning message is presented; the returned information is of the magnitude ||G(jw)|| or ||G(exp(jwT))|| only; phase information is not computed. |
| [zer, gain] = tzero (a, b, c, d, opt) | Function File |
| [zer, gain] = tzero (sys, opt) | Function File |
Compute transmission zeros of a continuous system:
. x = Ax + Bu y = Cx + Duor of a discrete one: x(k+1) = A x(k) + B u(k) y(k) = C x(k) + D u(k) Outputs
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| zr = tzero2 (a, b, c, d, bal) | Function File |
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Compute the transmission zeros of a, b, c, d.
bal = balancing option (see balance); default is Needs to incorporate |