MATLAB BODE PLOT.

num = [4500];

den = [1 1 0];

G = tf(num , den);

G1 = tf(1, den);

G = G*G1;

P = bodeoptions; % Set phase visiblity to off and frequency units to Hz in options

P.PhaseVisible = 'on';

P.FreqUnits = 'Hz'; % Create plot with the options specified by P

bode(G,P)

grid on

>>help bodeoptions

 BODEOPTIONS Creates option list for Bode plot.

 

    P = BODEOPTIONS returns the default options for Bode plots. This

    list of options allows you to customize the Bode plot appearance

    from the command line. For example

          P = bodeoptions;

          % Set phase visiblity to off and frequency units to Hz in options

          P.PhaseVisible = 'off';

          P.FreqUnits = 'Hz';

          % Create plot with the options specified by P

          h = bodeplot(tf(1,[1,1]),P);

    creates a Bode plot with the phase plot visbility turned off and the

    frequency units in Hz.

 

    P = BODEOPTIONS('cstprefs') initializes the plot options with the

    Control System Toolbox preferences.

 

    Available options include:

       Title, XLabel, YLabel         Label text and style

       TickLabel                     Tick label style

       Grid   [off|on]               Show or hide the grid

       XlimMode, YlimMode            Limit modes

       Xlim, Ylim                    Axes limits

       IOGrouping                    Grouping of input-output pairs       [none|inputs|output|all]

       InputLabels, OutputLabels     Input and output label styles

       InputVisible, OutputVisible   Visibility of input and output channels

       FreqUnits [Hz|rad/s]          Frequency Units

       FreqScale [linear|log]        Frequency Scale

       MagUnits [dB|abs]             Magnitude Units

       MagScale [linear|log]         Magnitude Scale

       MagVisible [on|off]           Magnitude plot visibility

       MagLowerLimMode         [auto|manual] Enables a lower magnitude limit

       MagLowerLim                   Specifies the lower magnitude limit

       PhaseUnits [deg|rad]          Phase units

       PhaseVisible [on|off]         Phase plot visibility

       PhaseWrapping [on|off]        Enables phase wrapping

       PhaseMatching [on|off]        Enables phase matching

       PhaseMatchingFreq             Frequency for matching phase

       PhaseMatchingValue            The value to make the phase repsonses

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margin(tf(num, den))

이 명령어는 GM 과 PM을 그림에 자동으로 보여주는 명령어이다.

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[pole,zero] = pzmap(tf(num, den))

근궤적이 아닌 pole과 zero에 대한 그림이다.