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Re: format questions [message #51637 is a reply to message #51636]

Fri, 01 December 2006 11:25

lee
Messages: 3
Registered: February 1993

Junior Member

Thank you very much for your quick response, David. Even I added
format, the number changed a little bit (see below). How to get it
exactly right? Your website is so helpful and thank you very much!

> print, mx, FORMAT='(D20.10)'
598594.3750000000
(the original number is 598594.35000000)

David Fanning wrote:
> lee writes:
>
>> ## Question : print out is different from the original file!!!!!!,
>> why?????
>> IDL> print, mx
>> 598594.
>> IDL> print, double(mx)
>> 598594.38
>> IDL> print, double(my)
>> 6738650.0
>
> Because you are not using a FORMAT that delivers enough
> accuracy. See the following article, about in the middle:
>
> http://www.dfanning.com/math_tips/sky_is_falling.html
>
> Something like:
>
> IDL> Print, mx, FORMAT='(D20.10)'
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: format questions By: Foldy Lajos on Fri, 01 December 2006 11:34
		Re: format questions By: David Fanning on Fri, 01 December 2006 11:30
		Re: format questions By: lee on Fri, 01 December 2006 11:25
		Re: format questions By: David Fanning on Fri, 01 December 2006 11:10

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