'bodeplot' properties can be changed
1. By passing 'bodeoptions' to 'bodeplot'
opts = bodeoptions('cstprefs');
opts.PhaseVisible = 'off';
opts.FreqUnits = 'Hz';
opts.Title.String = 'My Title';
opts.XLabel.String = 'My XLabel';
opts.Title.FontSize = 12;
h = bodeplot(tf(1,[1,1]),opts);
2. By using setoptions to modify the properties after 'bodeplot' is created.
h = bodeplot(tf(1,[1,1]));
options = getoptions(h);
options.PhaseVisible = 'off';
opts.FreqUnits = 'Hz';
options.Title.String = 'My Title';
options.XLabel.String = 'My XLabel';
options.Title.FontSize = 12;
setoptions(h,options);
For more details, please refer - http://www.mathworks.com/help/control/ref/bodeoptions.html
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