Re: [Gnuplot-info] Controlling major tic marks when x axis is a date

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

> I've got a "by day" graph, with the x axis as dates.  I'd like my major tic
marks to be weeks. 
> I know how to control tic marks and turn on a grid, but the date part is
> confusing me.  Hints?

set xtics "2008-03-10",7*24*60*60
set xrange ['2008-03-10':'2008-05-01']

the starting date is converted into seconds internally (starting at
'2000/01/01 00:00:00 UTC'),
the increment is given in seconds.
(you could instead write "2000-01-08" which is also 1 week:
set xtics "2008-03-10","2000-01-08" 
;-)

the mxtics are set automatically.

if your xrange exceeds 20 weeks, gnuplot switches to monthly xtics.
(in case you have a problem with this behaviour, there is a patch:
http://sourceforge.net/tracker/index.php?func=detail&aid=1908019&group_id=2055&atid=302055
)

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