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Re: formatting array output? [message #33862 is a reply to message #33861]

Thu, 30 January 2003 08:37

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

Murat Maga wrote:
>
> Hi All,
> 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?
> Best,
> Murat

I presume that this file is being written in ASCII rather than binary
format for portability reasons, and not for human readability. When a
single line of the matrix contains a thousand or more elements, it's a
pretty safe bet that humans won't be reading it. I've never heard of a
display devise big enough to display a single row of that matrix all on
one line.

That being the case, why do you care where it breaks the line? It's easy
enough to write code that reads the file in a way that treats the
newline characters the same as other whitespace characters. That's true
not only in IDL, and also in several other languages that I know.

However, if you do indeed want to do this, print/printf does indeed seem
to be the way to go. The only "tricks" I'm aware of are repeat counts
and format reversion:

array = fltarr(2000,1000)
readf,infile,array
printf,outfile,'$(2000F)', array

These feel like tricks to someone coming from a C background; but for
Fortran programmers it seems quite normal.

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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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