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Re: formatting array output? [message #33844]

Fri, 31 January 2003 08:41

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Murat Maga (maga@mail.utexas.edu) writes:

> I have an integer array (2000x1000) which I would like to write in file
> in the typical matrix convention. I think IDL breaks the line at 80th
> column and everything starts to look quite messy.
> To format an array output, do I use the print/printf, or are there any
> other tricks good to know?

Years ago, before all of us were born (circa 1875), computer
programs weren't written in a text editor. They were written
on punch cards. You hammered away at a big typewriter-like
console with really big keys. You had to slam them pretty good,
because the arms of the keys had to punch a chad out of the
card. Hanging chads were quite a serious problem in those
days (I.e., it wasn't just the future of our country that
depended upon it, it was an extra day or two running back
and forth to the computer center that was at stake!).

Anyway, those cards had 80 columns and the number 80
has been indelibly imprinted on computer operations
ever since. If you want your output "line" to have,
say, 20000 columns (suitable for 2000 values, each
having a width of 10 characters), you would use the
WIDTH keyword when you open the file:

OPENW, 1, 'myfile.txt', Width=20000

Now you can put your data into the file in the way
you like:

FOR j=0,999 DO PRINTF, 1, data[*,j], Format='(I10)'

When you look at it in a text editor, however, you might
find that the editor word-wraps at 80 characters. :-(

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: formatting array output? By: David Fanning on Fri, 31 January 2003 08:41
		Re: formatting array output? By: thompson on Fri, 31 January 2003 08:12
		Re: formatting array output? By: James Kuyper on Thu, 30 January 2003 12:29
		Re: formatting array output? By: Mark Hadfield on Thu, 30 January 2003 12:34
		Re: formatting array output? By: Murat Maga on Thu, 30 January 2003 14:09
		Re: formatting array output? By: James Kuyper on Thu, 30 January 2003 08:41
		Re: formatting array output? By: Paul Van Delst[1] on Thu, 30 January 2003 08:39
		Re: formatting array output? By: James Kuyper on Thu, 30 January 2003 08:37
		Re: formatting array output? By: K. Bowman on Thu, 30 January 2003 06:25

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