Plotting data with timestamps

26 次查看（过去 30 天）

lexi11 2016-11-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/314361-plotting-data-with-timestamps

评论： dpb 2018-10-31

Hi,

I have some data from a sensor and corresponding timestamps. How do I plot this data? (x axis - timestamps, y-axis - data) plot function gives empty figures. Probably because timestamps cannot be put in a linear scale. I tried semilogx - this also gives empty figures.

How do I do this?

Thanks in advance

2 个评论
显示无隐藏无

Ryan Smith 2016-11-28

Can you provide the data as an attachment?

lexi11 2016-11-28

timestampdata1.png

Hi, the timestamps are in unix format. I have attached a set of them. Since in excel it shows as 1.48E+10 format, I have changed the type in excel to 'number' so that you can see the entire number. So it adds .00 in the end to each value, but originally I get in the 1.48E+10 like number representation. Thank you.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

dpb 2016-11-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/314361-plotting-data-with-timestamps#answer_245013

编辑：dpb 2016-11-28

Convert from whatever format the timestamps are in to a Matlab representation of dates...with R2014 up, there's the datetime class; prior to that use datenum. See <datetime> for current versions; plot is datetime -aware.

7 个评论
显示 5更早的评论隐藏 5更早的评论

Peter Perkins 2018-10-31

在 MATLAB Online 中打开

In recent versions of MATLAB, you can also convert directly from ms since 1970:

>> datetime(1489337264031,'ConvertFrom','EpochTime','TicksPerSecond',1000,'Format','dd-MMM-yyyy HH:mm:ss.SSS')
ans = 
  datetime
   12-Mar-2017 16:47:44.031