How do i get Char into Double

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Jelthe
Jelthe 2016-3-31
评论： Image Analyst 2016-3-31
Hello,
Does anyone know how i get timeinformation saved as a char into a double? I want to plot something over a time (HH:MM:SS) i got the information as a Workspace variable but as a class. I need it as an double to plot it.
thanks

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回答（2 个）

Image Analyst
Image Analyst 2016-3-31
Use datenum(). From the help:
format long
t = [datetime('now');datetime('tomorrow')]
DateNumber = datenum(t)
t =
07-Jan-2016 15:42:14
08-Jan-2016 00:00:00
DateNumber =
1.0e+05 *
7.363366543368312
7.363370000000000
  2 个评论
Jelthe
Jelthe 2016-3-31
Ok so i do have the timeinformation in decimalform then. How do i get it back into timeform when i plot it? so that the x-axes says 16:40 ....
Image Analyst
Image Analyst 2016-3-31
You can make the tick marks whatever list of strings you want:
ax = gca;
ax.XTickLabel = yourCellArrayOfTimeStrings;
Example from the help:
ax.XTickLabel = {'-3\pi','-2\pi','-\pi','0','\pi','2\pi','3\pi'};

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Ilham Hardy
Ilham Hardy 2016-3-31
Maybe this will help? str2num

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