Matlab 图 'age'

Question

这里有一个问题要问“Matlab 中记录较少的部分的专家”:是否有一种(未记录的？)方法来确定图形已打开多长时间(即图形的“年龄”)？

figure; spy;
myfig=gcf;
age=get_age() %shoud output age of figure in some format

Answer 1

您可以使用以下机制:

首先，创建一个如下所示的小 Matlab 函数，将 CreationTime 属性附加到图形:

function setCreationTime(hFig,varargin)
   hProp = addprop(hFig,'CreationTime');
   hFig.CreationTime = now;
   hProp.SetAccess = 'private'; %make property read-only after setting its initial value

   hProp = addprop(hFig,'Age');
   hProp.GetMethod = @(h,e) etime(datevec(hFig.CreationTime), clock); %compute on-the-fly
   hProp.SetAccess = 'private'; %make property read-only
end

现在将此函数指定为所有新图形的默认 CreateFcn 回调函数:

set(0,'DefaultFigureCreateFcn',@setCreationTime)

就是这样 - 你已经完成了!

例如:

>> newFig = figure;
>> newFig.CreationTime
ans =
      737096.613706748

>> ageInDays = now - newFig.CreationTime
ageInDays = 
       0.01625078368466347
>> ageDuration = duration(ageInDays*24,0,0)
ageDuration = 
  duration
   00:23:24
>> ageString = datestr(ageInDays, 'HH:MM:SS.FFF')
ageString = 
    '00:23:24.068'

>> ageInSecs = newFig.Age
ageInSecs =
    1404.067710354923808