This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
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NyquistGridLines

NyquistGridLines
is an option to NyquistPlot that specifies contours of constant magnitude and phase of a closed-loop system.
  • The following settings can be given:
Noneno contours drawn
Automaticcontours chosen automatically
{magnitude,phase}contours specified by magnitude and phase are drawn
  • magnitude values are the absolute values.
  • phase values are given in radians.
  • The following settings can be given for magnitude and phase:
Noneno contours drawn
Automaticcontours chosen automatically
{c1,c2,...}draw the contours
{{c1,style1,r1},...}contours with specified styles and regions
  • The default setting for is Dashed for magnitude contours and Dotted for phase contours.
  • The setting specifies that a point should be included if yields True.
  • The default value of is True.
Show the closed-loop magnitude and phase contours:
Show the closed-loop magnitude and phase contours:
In[1]:=
Click for copyable input
Out[1]=
Choose contours automatically:
Show the specified magnitude and phase contours:
Use different contour styles:
Specify different regions:
Specify contours with magnitude -12 dB, -13 dB, -15 dB, and -18 dB:
Specify contours with phase from -60 to 60 degrees in increments of 10:
The contours depend on the feedback type:
The contours are shown only in the finite regions:
A discrete-time system:
Estimate closed-loop magnitude and phase values at various frequencies:
New in 8