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MathGroup Archive 2005

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Re: How to display dates in plots

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58724] Re: [mg58705] How to display dates in plots
  • From: János <janos.lobb at yale.edu>
  • Date: Fri, 15 Jul 2005 14:14:06 -0400 (EDT)
  • References: <200507150702.DAA23105@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Jul 15, 2005, at 3:02 AM, ggroup at sarj.ca wrote:

> I'm evaluating Mathematica v5.1 to automate some data analysis for me.
> I have one question that I have yet to find an answer (or even a  
> clue).
>  I was hoping someone here may have a good idea.
>
> I collect data sets that I want to plot in various ways versus time.
> Each record in the data sets includes a date/time string and various
> (numeric) sensor readings.  I've got an ugly but effective loop to
> convert the date strings in my data files to serial time.  I've been
> this serial time to plot my data.  Now the question is: is there a way
> to format the plot axes to display a human readable date rather than
> the serial date?
>
> One note: Not all the data records are taken at regular intervals.
> When an event is happening on one of the sensors, we often increase  
> the
> sampling frequency to get better resolution.
>
> Thanks very much.
>

In one case I have my dates in seconds in b0b0[[All,1]] and I use an  
expression in Tick to convert it to readable date strings.

Ticks -> {({FromDate[#1], ToString[#1[[3]]]} & ) /@ ToDate /@ Pick 
[b0b0[[All,1]], (Mod[#1, 86400] < 900 & ) /@ b0b0[[All,1]]], Automatic}

János


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