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Re: writing large 3D data file fails [message #68560 is a reply to message #68263]

Mon, 02 November 2009 17:51

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

A.R. writes:

> So, this will work to write your data to one file, but the next issue
> crops up if you want to re-open it and work with it again. Trying to
> 'readu' a volume with more than 2^31 elements also crashes IDL due to
> a segmentation fault.
>
> If you can figure out how to re-open it, then you'll really make my
> day! Still can't figure that one out . . .

If you can get by reading it a slice at a time
(from anywhere in the stack), then the Associated
Variable method is the way to go. Suppose each
"slice" is a 4000 by 5000 floating point array:

Openr, lun, 'myfile.dat', /Get_Lun
data = Assoc(lun, FltArr(4000,5000))

Now, if you wanted the 35th slice:

slice = data[34]

When you are done with it, just close it.

Free_Lun, lun

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]

		writing large 3D data file fails By: dorthe on Wed, 07 October 2009 05:17
		Re: writing large 3D data file fails By: Mark[1] on Wed, 14 October 2009 14:57
		Re: writing large 3D data file fails By: A.R. on Mon, 02 November 2009 14:17
		Re: writing large 3D data file fails By: David Fanning on Mon, 02 November 2009 17:51
		Re: writing large 3D data file fails By: penteado on Mon, 02 November 2009 14:31

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