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time format and xrange or missing data "."

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  time format and xrange or missing data "." bryan <bryanlepore@gmail.com> - 2012-05-15 10:15 -0700
    Re: time format and xrange or missing data "." Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2012-05-15 19:52 +0200
      Re: time format and xrange or missing data "." bryan <bryanlepore@gmail.com> - 2012-05-15 11:14 -0700

#1111 — time format and xrange or missing data "."

[ gnuplot 4.6 patchlevel 0 ]

trying to understand use of 'set xdata time' vis-a-vis the following points:

I would like to set xrange longer than the available data. I used a "." to mark missing data points. I can plot the first field (see below) using a conventional x/y data setup and various xranges (not shown). however when using 'set xdata time' it appears that this will not work. Note that I have the date in field 2, but this shouldn't matter I think. here are the commands:

gnuplot> set xdata time ; set timefmt '%m-%Y' ; set format x '%b'
gnuplot> plot 'data.dat' u 2:1 w lp

( ... looks OK ...)
            
gnuplot> set xrange [0:14] 
gnuplot> replot           
gnuplot> plot 'data.dat' u 2:1 w lp                                                 
         all points y value undefined!
gnuplot> show xrange

	set xdata time
	set xrange [ * : * ] noreverse nowriteback  # (currently ["10-2011":"05-2012"] )

data.dat:

8.38  11-2011 
1.58  12-2011 
3.13  01-2012 
9.74  02-2012 
2.78  03-2012 
6.51  04-2012 
4.43  05-2012 
 .    06-2012
 .    07-2012
 .    08-2012
 .    09-2012
 .    10-2012
 .    11-2012
 .    12-2012

-Bryan

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#1112

On 15.05.2012 19:15, bryan wrote:

> I would like to set xrange longer than the available data.

> gnuplot>  set xdata time ; set timefmt '%m-%Y' ; set format x '%b'
> gnuplot>  plot 'data.dat' u 2:1 w lp
>
> ( ... looks OK ...)
>
> gnuplot>  set xrange [0:14]

How do you expect that to work for a time?  What time/date is '14' 
supposed to be?

If you're going to use time/date axes, your range will have to be in 
time/date format, too.  Gnuplot even, kinda-sorta, tells you so:

> gnuplot>  show xrange
>
> 	set xdata time
> 	set xrange [ * : * ] noreverse nowriteback  # (currently ["10-2011":"05-2012"] )

Note that "currently" setting.  That's how you're supposed to spell a 
setting of the xrange in this case.

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#1113

Gah - of course, that makes sense.

I'll try it.  Thanks.

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