How can I plot a bode diagram with random color?

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sadel 2011-6-21

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What should I add to this code to have a random color?

sys=tf(1,[1 1])
bode(sys)

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Paulo Silva 2011-6-21

Please always provide detailed questions so we can help you better and faster

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Paulo Silva 2011-6-21

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Another strange question from sadel, I never seen someone doing so many strange things but it's all good, here's a variation from Chirag Gupta code:

sys=tf(1,[1 1]);
ColList='ymcrgbk'; %no w letter because you won't see the white line 
col=randi([1 7]);
bode(sys,ColList(col))

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sadel 2011-6-21

Can I use Dynamic Legend with "hold all"?

Paulo Silva 2011-6-21

function testbode

figure

pbh = uicontrol(gcf,'Style','pushbutton','String','Add another',...

'Position',[10 20 60 40],...

'callback',@newbode);

axes

hold all

function newbode(obj,event)

num=ones(1,randi([1,2]));

den=ones(1,randi([3,6]));

sys=tf(num,den)

hold all

sysn=evalc('sys')

[a b] = strread(sysn, '%s %s', 'delimiter',char(10))

num=char(a(2));

den=char(a(3));

linesep=char(b(2));

set(sys,'Name',[num char(10) linesep char(10) den])

bode(sys)

legend('-DynamicLegend');

end

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更多回答（4 个）

Chirag Gupta 2011-6-21

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   colors =['r','b','g','y','m','k'];
   c = ceil(6*(rand))
   bode(sys,colors(c))

This will pseudo randomly choose one of the 6 colors. You can obviously add more colors to the list!

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Chirag Gupta 2011-6-21

MATLAB figures default to a particular color. Unless you change that setting or change the colors via code, you will get the same color.

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Walter Roberson 2011-6-21

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在 MATLAB Online 中打开

Provided that your systems are not MIMO,

sys=tf(1,[1 1]);
h = bodeplot(sys);   %notice this is _not_ bode()
for L = findobj(h,'type','line')
  set(L,'Color', rand(1,3));
end

Note: this does not attempt to match colors between the frequency and phase components. You did ask for random color...

I do not have the appropriate toolbox to probe to determine what would be needed to use the same color between the two halves when multiple systems are being drawn on the same plot, or when bode() is used to draw an array of bode plots for a MIMO system.

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Walter Roberson 2011-6-21

If you cannot have similar or duplicate colors, then the colors have not been chosen at random as requires by the original question ;-)

Paulo Silva 2011-6-21

Good point Walter :)

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Niels 2013-5-2

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Here is a solution for giving bode plots a different color than and then 'ymcrgbk' and subsequently saving the figure without unwanted changes to the legend.

sys1=tf(1,[1 1]); sys2=tf(1,[1 1 1]);

figure; hold on;

bode(sys1,'b'); bode(sys2,'r');

h1 = findobj(gcf,'Color','b','-and','linestyle','-'); set(h1,'linewidth',1,'color',[.9 .9 .9]);

h2 = findobj(gcf,'Color','r','-and','linestyle','-'); set(h2,'linewidth',2,'color',[.5 .5 .5]);

legend([h1(1) h2(1)],'system 1','system 2')

It is important to assign the first term of the handle (e.g. h1(1)) in order to avoid issues with matrix dimentions (horzcat)