- Function File:
**nyquist***(*`sys`) - Function File:
**nyquist***(*`sys1`,`sys2`, …,`sysN`) - Function File:
**nyquist***(*`sys1`,`sys2`, …,`sysN`,`w`) - Function File:
**nyquist***(*`sys1`,`'style1'`, …,`sysN`,`'styleN'`) - Function File:
*[*`re`,`im`,`w`] =**nyquist***(*`sys`) - Function File:
*[*`re`,`im`,`w`] =**nyquist***(*`sys`,`w`) Nyquist diagram of frequency response. If no output arguments are given, the response is printed on the screen.

**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 plot`

for details.

**Outputs**`re`Vector of real parts. Has length of frequency vector

`w`.`im`Vector of imaginary parts. Has length of frequency vector

`w`.`w`Vector of frequency values used.

**See also:**bode, nichols, sigma.

Package: control