How to plot more points with bodeplot

I'm making bode plots of transfer functions, but sometimes I want to check the magnitude a specific frequency and I can't check it because Matlab didn't make a point there (or anyware nearby). Does anyone knows how to force Matlab to make plot points? I'm using bodeoptions to convert the frequency scale from rad/s to Hz, but I could not find any option regarding how many points do I want to plot, or the frequency range. Thanks!

Answer 1

[Rajiv Singh]

You can specify the frequency vector you want as an input argument to BODE or BODEPLOT. You can also fetch the magnitude/phase explicitly [mag, phase] = bode(sys, my_desired_frequencies)

http://www.mathworks.com/help/toolbox/control/ref/bodeplot.html

[Diego]

Thank you! That really helped me.

[Pierre Chassard]

Thank you;

figure(3)

h=bodeplot(FT,'r',(100:1:10000)*(2*pi)) ;

opt = getoptions(h);

opt.FreqUnits = 'Hz' ;

opt.Xlim = [100 , 10000] ;

opt.PhaseMatching= 'on';

opt.Ylim = {[-50 20] [-180 0]};

setoptions(h,opt);

title('FTglobale') ;

legend('FTglobale');

grid on