| Using TICKINTERVAL with LABEL_DATE in object_graphics [message #64951] |
Mon, 02 February 2009 10:30 |
dcleon@gmail.com
Messages: 12
Registered: November 2007
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Junior Member |
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Just wasted more time than I care to mention figuring out how to
control the tick spacing using TICKINTERVAL in conjunction with
LABEL_DATE. Hopefully, I can save somebody else the same thrash --
either that or somebody can point out that what I think I've figured
out is total bunk.
Per IDL's documentation, TICKINTERVAL is used to set the spacing
between tickmarks. What they fail to mention is that (when used with
LABEL_DATE and TICKUNITS = 'TIME') that the units of the spacing
between tickmarks change depending on the axis interval. If the
elapsed time over the plot range is:
<= 60 seconds, then TICKINTERVAL is in
seconds.
> 60s seconds, but <= 60 min TICKINTERVAL is in minutes
> 60 min, but <= 24 Hours, then TICKINTERVAL is in hours
> 24 Hours, but < 1 month, then TICKINTERVAL is in days
(I'm not sure how this works given the varying # of days in a month).
.... (I assume the behavior continues to be consistent for
months and years, but I've wasted too much time on this already to
bother verifying).
Perhaps this is spelled out clearly somewhere in the IDL
documentation, but I sure never found it.
Cheers
dave
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