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Re: array of Julian Days [message #63521]

Wed, 12 November 2008 10:13

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Bulrush writes:

> On Nov 12, 9:37=A0am, David Fanning <n...@dfanning.com> wrote:
>> Bulrush writes:
>>> With the while loop, I got only 8 values, each increased just +1, e.g.
>>> 264,265,266... even if I set the step as 8. And become dead loop,
>>> looping all the day non-stop for that the same 8 values.
>>
>> Your while loop ran all day long because you never
>> changed the conditional variable. Thus, it started
>> true and it remained true. (It's probably still true
>> now!)
> Here is the updated code. How can I stop then. Why the days are not
> increasing steps of 8, and just increasing with an increment of 1?
> JDays = LINDGEN(366)
> Daystep = 265
> ; collect the days
>
> WHILE Daystep LE 363 Do Begin
> arr =D WHERE((JDays LE Daystep+8) AND (JDays GT Daystep),count)
> IF count GT 0 THEN Days =JDays[arr] ELSE days = [-1]
> print, days
> ENDWHILE

You can stop it by making the control variable "daystep"
greater than 363. You don't change it's value anywhere
in this loop, so it *stays* less than 363 forever and ever.

If you put a breakpoint in your code and step through this
a couple of times, I think eventually you will discover the
problem. :-)

Cheers,

David

--
David Fanning, Ph.D.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: array of Julian Days By: David Fanning on Wed, 12 November 2008 10:13
		Re: array of Julian Days By: Wasit.Weather on Wed, 12 November 2008 09:09
		Re: array of Julian Days By: David Fanning on Wed, 12 November 2008 07:37
		Re: array of Julian Days By: Wasit.Weather on Wed, 12 November 2008 07:21
		Re: array of Julian Days By: R.Bauer on Wed, 12 November 2008 01:08
		Re: array of Julian Days By: R.Bauer on Wed, 12 November 2008 01:05
		Re: array of Julian Days By: Craig Markwardt on Tue, 11 November 2008 15:24
		Re: array of Julian Days By: Wasit.Weather on Tue, 11 November 2008 14:37
		Re: array of Julian Days By: Wasit.Weather on Tue, 11 November 2008 14:35
		Re: array of Julian Days By: David Fanning on Tue, 11 November 2008 14:12
		Re: array of Julian Days By: R.G. Stockwell on Tue, 11 November 2008 13:57
		Re: array of Julian Days By: R.Bauer on Tue, 11 November 2008 13:51
		Re: array of Julian Days By: R.Bauer on Thu, 13 November 2008 01:32

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