Categories &
Functions List
Function Reference: nichols
Function File: nichols (sys)
Function File: nichols (sys1, sys2, …, sysN)
Function File: nichols (sys1, sys2, …, sysN, w)
Function File: nichols (sys1, ’style1’, …, sysN, ’styleN’)
Function File: [mag, pha, w] = nichols (sys)
Function File: [mag, pha, w] = nichols (sys, w)
Nichols chart of frequency response, plots gain over phase. If no output arguments are given, the response is printed on the screen together with a grid of contours of constant close-loop magnitude and phase.
Inputs
- sys
- LTI system. Must be a single-input and single-output (SISO) system.
- w
- Optional vector of frequency values. If w is not specified,
it is calculated by the zeros and poles of the system.
Alternatively, the cell
{wmin, wmax}specifies a frequency range, where wmin and wmax denote minimum and maximum frequencies in rad/s. - ’style’
- Line style and color, e.g. ’r’ for a solid red line or ’-.k’ for a dash-dotted
black line. See
help plotfor details.
Outputs
- mag
- Vector of magnitude. Has length of frequency vector w.
- pha
- Vector of phase. Has length of frequency vector w.
- w
- Vector of frequency values used.
See also: bode, nyquist, sigma
Source Code: nichols
s = tf('s');
G = 1/(2*s^2+3*s+4);
nichols(G);
