Converting regular numbers into "time"

2012 4 12
1 个回答
2 次查看（30 天）

0 个投票

Hi everyone,
I have a question. If I define a vector like so:
TStart = 0; TEnd = 1000; TStep = 1; Time = TStart:TStep:TEnd;
Is there any way where I can convert this to date format, so that when I plot:
plot(Time,Data)
The x axis will have time stamps corresponding to the way I defined my Time array, and not just numbers?
I looked into datetick, but I'm not sure if I am on the right track here...

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2012-4-12

0 个投票

For datetick to work, the Time vector should be in the unit of full days. If, for example, your TStep was intended to reflect hours, then divide Time by 24

6 个评论
显示 4更早的评论 隐藏 4更早的评论

Sarah
Sarah 2012-4-13
So what would my plot end up looking like? Lets say:
TStart = 0;
TEnd = 1000;
TStep = 1;
Time = TStart:TStep:TEnd;
TStep is by seconds. So I have to divide my time vector by 86400? And will the plot reflect my data in days?
Walter Roberson
Walter Roberson 2012-4-13
Right. Suppose you wanted to show hours and minutes, then
plot(Time ./ 86400, Data);
datetick('x', 'HH:MM')
Sarah
Sarah 2012-4-14
Hmmm, I am still getting 00:00 for each tick on my plot. Does my data affect datetick?
Walter Roberson
Walter Roberson 2012-4-14
The data will not affect datetick.
Oleg Komarov
Oleg Komarov 2012-4-14
@Sarah: your result is inconsistent with the example.
If you run the example you provided, together with Walter's code, you should be getting 5 ticks: 00:00, 00:05, 00:10, 00:15 and 00:20.
Peter Wittenberg
Peter Wittenberg 2012-4-14
The 00:00 is correct for the time you put in. What's happening is that you are putting in a time stream so long that MATLAB is choosing tick mark dates that are integers, with each integer being a full day, starting at 00:00 when you put it in the HH:MM format. Adjust the time variable so that it covers a total time interval of less than one day and you'll see other numbers. For example, time =0:.001:1 will give you 1000 points spaced at 1/1000 of a day (1.44 minute) intervals

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Dates and Time 的更多信息

标签

提问:

Sarah
Sarah
2012-4-12

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by