www.gusucode.com > graphics 案例源码程序 matlab代码 > graphics/ConvertNumericValueToEquivalentDateValueExample.m
%% Convert Date Value to Equivalent Numeric Value % Convert a date value to the equivalent numeric value in order to set the % |Position| property of a text object. % % Create a plot with dates along the _x_-axis. Add % a text description to the fourth data point and return the text object. t = datetime(2015,1,1:10); y = [.2 .3 .5 .2 .8 .2 .3 .1 .3 .4]; plot(t,y,'-o') txt = text(t(4),y(4),'My text'); %% % Change the position of the text to the sixth data point by setting the % |Position| property of the text object. Since the |Position| property % accepts only numeric values, convert the datetime value at the sixth data % point to the equivalent numeric value. ax = gca; x6 = ruler2num(t(6),ax.XAxis); txt.Position = [x6 y(6)];