| xtickformat type conversion [message #86309] |
Thu, 24 October 2013 18:56  |
Matthew Argall
Messages: 286
Registered: October 2011
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Senior Member |
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CDF_TIME_TT2000 times are type LONG64. When I try to use these values to create a formatted tick label with, say, XTICKLABEL='my_tickformat_function', it automatically converts the times to double precision.
Is there any way to create my own tick-label function and have it preserve the LONG64 data type? (Something like 'HH:MM:SS!CYYYY-MM-DD'... Other date representations have drawbacks that I would like to avoid)
Does this mean that plotted values are also converted to either floats or doubles before being plotted?
Thanks
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| Re: xtickformat type conversion [message #86311 is a reply to message #86309] |
Fri, 25 October 2013 04:56  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Matthew Argall writes:
> CDF_TIME_TT2000 times are type LONG64. When I try to use these values to create a formatted tick label with, say, XTICKLABEL='my_tickformat_function', it automatically converts the times to double precision.
>
> Is there any way to create my own tick-label function and have it preserve the LONG64 data type? (Something like 'HH:MM:SS!CYYYY-MM-DD'... Other date representations have drawbacks that I would like to avoid)
I can think of another drawback. How many of these long numbers to you
think you could actually FIT on a plot with your tick formatting
function? It seems to me converting to double precision values would
make some sense. Then at least you can use exponential notation to
shorten them enough to get them on a plot.
> Does this mean that plotted values are also converted to either floats or doubles before being plotted?
I don't know. But if I were writing a plotting function, carrying around
64-bit integers would probably be the last thing I would be thinking
about.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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