Re: [Gnuplot-info] Problem with date format

[Thomas S. <t.s...@fz...>]

if your xrange is 20 weeks or lower , e.g.

    set xrange ["01/01/2007":"20/05/2007"]

everything works as expected, but if you exceed 20 weeks,

    set xrange ["01/01/2007":"21/05/2007"]

xtics are placed at 'beginning of month' and mxtics are drawn
at wrong positions.

this behaviour has nothing to do with the actual number of tics
on the x-axis.

it seems to be some mechanism in 'axis.c' which should prevent
the axis from getting overcrowded with tics.
(see 'quantize_time_tics' in 'axis.c' which is calling
'quantize_duodecimal_tics' or - as in your case -
'quantize_normal_tics')

don't know how to solve this :-(

thomas


Cameron Horsburgh wrote:
> 
> Hi folks,
> 
> I'm using the Debian version of gnuplot 4.2 patchlevel 2.
> 
> I have a file (data.dat) with two columns. The first contains 
> dates and the other contains measured data:
> 
> 03/03/2007 89.8	  
> 04/04/2007 85.4
> 05/05/2007 79.0
> 12/06/2007 78.3
> 18/07/2007 77.0
> 13/09/2007 65.6
> 29/12/2007 65.0
> 
> I wish to graph my data (y axis) against the date (x axis).
> I want the x axis to show day of the month and the month, and
>  increment weekly. So I use the following list of commands:
> 
> 
> 
> set xdata time
> set timefmt "%d/%m/%Y"
> set format x "%d/%m"
> set xtics "03/03/2007",604800 # number of seconds in a week
> plot "data.dat" using 1:2 notitle
> 
> 
> 
> The output isn't what I expect. The major tics all seem to round to
> the first day of the month and several minor tics appear after each
> major. If I change a few things around --- for example, change the x
> format to other units, change the increment size, etc, the same thing
> happens. All xtics round to the nearest first of the month.
> 
> The data itself plots correctly
> 
> I've looked through the documentation but I seem to be missing
> something fairly obvious. Can anyone help?
> 
> -- 
> 
> =============================================
> Cameron Horsburgh
> 
> =============================================
> 
> 
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