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Re: Convert MJD date range to number of days elapsed in IDL [message #93662 is a reply to message #93661]

Mon, 26 September 2016 06:46

wlandsman
Messages: 743
Registered: June 2000

Senior Member

If you have a vector of modified Julian dates, MJD, and want to convert them to elapsed time from a scalar reference time, MJD0, then just subtract

IDL> TElapse = MJD - MJD0

I suspect that you actually asking for something else but, if so, you will have to clarify your question. --Wayne

On Sunday, September 25, 2016 at 3:53:03 PM UTC-4, cdav...@terpmail.umd.edu wrote:
> I'm trying to figure out if there's some way I can take a range of MJD values and convert them into number of days elapsed over that range so I can normalize a plot of two supernova and their absolute magnitudes over time in IDL. Is there a simple conversion for this I'm not seeing or do I need to tediously convert every value to determine the number of days to use for my x-axis?
>
> Note: I do not wish to convert to the date, but the actually number of days elapsed as to normalize my two plots for comparison.
>
> Thanks!

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[Message index]

		Convert MJD date range to number of days elapsed in IDL By: cdav1601 on Sun, 25 September 2016 12:53
		Re: Convert MJD date range to number of days elapsed in IDL By: wlandsman on Mon, 26 September 2016 06:46
		Re: Convert MJD date range to number of days elapsed in IDL By: Markus Schmassmann on Mon, 26 September 2016 06:54

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