Basics of MATLAB and Beyond

These commands change special Text objects that are associated withthe Axes object:>> yl = get(gca,’ylabel’);>> get(yl,’String’)ans =y axis>> set(yl,’Rotation’,0)>> pos = get(yl,’pos’);>> set(yl,’pos’,[0.35 3])To be friendly to the viewers of your graphs, you should always placeyour y labels horizontally. Multi-line labels can be done easily using cellarrays:>> str = {’The answer is below:’;[’It is ’ num2str(pi)]}str =’The answer is below:’’It is 3.1416’>> title(str)33 Text in GraphicsThe commands xlabel, ylabel, zlabel, and title are used to put textin special places around the plot. A general way to place text is to usetext commands:x = 0:.01:2;plt(x,humps(x))axis tight[ym,i] = max(humps(x));str = [’Maximum value: ’ ...num2str(ym)];text(x(i),ym,str)The first two inputs to text define the x and y coordinates of the text’sreference point. (The gtext command allows you to define the referencepoint with the mouse.) You can give a third, z-value, to the text commandto place text on three-dimensional plots. Issuing text commandscreates Text objects, which have a great many properties (type get(h),where h is the handle of a Text object). Often you want to change theway the text is aligned to its reference point. By default, text is horizontallyaligned such that the left-hand edge is near the reference point,and vertically aligned such that the middle of the text is near the referencepoint. The following diagrams show the effect of changing a Textc○ 2000 by CRC Press LLC