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From: Luna Moon on 6 Jul 2010 08:57
Hi all,

I have an Nx2 array, where the first column contains the timestamps
and the second column contains the corresponding data.

second | ts
--------| --
14:25:00| 18
14:25:02| 14
14:25:04| 11
14:25:06| 4
14:25:08| 24
14:25:10| 13
14:25:12| 12
14:25:14| 6
14:25:16| 21
14:25:18| 37
14:25:20| 21
14:25:22| 9


In Matlab, the first column becomes:


0.600694444496185
0.600752314785495
0.600810185191222
0.600868055596948
0.600925925886258
0.600983796291985
0.601041666697711
0.601099536987022
0.601157407392748

How do I plot such data with X-axis showing the timestamps (seconds)
and the Y-axis showing the data?

Thanks a lot!
From: dpb on 6 Jul 2010 09:09
Luna Moon wrote:
....

> How do I plot such data with X-axis showing the timestamps (seconds)
> and the Y-axis showing the data?

doc datetick

Altho unless datetick has been upgraded since my version w/ some
additional flexibility you may have to simply plot the seconds values
themselves to get a full precision scaling given the small variation
shown. If this is just a very short subset so the overall time span is
larger it may work.

In the release here I got a "divide-by-zero" error in datetick but a
sorta' half-baked scale in hh:mm:ss format which is the lowest
resolution datetick can handle (again unless it's been improved).

--
From: Steven Lord on 6 Jul 2010 09:28

"Luna Moon" <lunamoonmoon(a)gmail.com> wrote in message
news:b44326d2-74a0-46af-99e6-5a017234459c(a)c10g2000yqi.googlegroups.com...
> Hi all,
>
> I have an Nx2 array, where the first column contains the timestamps
> and the second column contains the corresponding data.

*snip*

> In Matlab, the first column becomes:

*snip*

> How do I plot such data with X-axis showing the timestamps (seconds)
> and the Y-axis showing the data?

Use PLOT and DATETICK in that order.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
To contact Technical Support use the Contact Us link on
http://www.mathworks.com


From: TideMan on 6 Jul 2010 16:02
On Jul 7, 1:28 am, "Steven Lord" <sl...(a)mathworks.com> wrote:
> "Luna Moon" <lunamoonm...(a)gmail.com> wrote in message
>
> news:b44326d2-74a0-46af-99e6-5a017234459c(a)c10g2000yqi.googlegroups.com...
>
> > Hi all,
>
> > I have an Nx2 array, where the first column contains the timestamps
> > and the second column contains the corresponding data.
>
> *snip*
>
> > In Matlab, the first column becomes:
>
> *snip*
>
> > How do I plot such data with X-axis showing the timestamps (seconds)
> > and the Y-axis showing the data?
>
> Use PLOT and DATETICK in that order.
>
> --
> Steve Lord
> sl...(a)mathworks.com
> comp.soft-sys.matlab (CSSM) FAQ:http://matlabwiki.mathworks.com/MATLAB_FAQ
> To contact Technical Support use the Contact Us link onhttp://www.mathworks.com

Alternatively, if the times are in t:
t=(t-t(1))*86400; % to get time in s from start
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