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Re: simple query: including loop variable in filename? [message #55900]

Fri, 14 September 2007 08:32

R.G.Stockwell
Messages: 163
Registered: October 2004

Senior Member

<id6684@googlemail.com> wrote in message
news:1189766081.164014.99750@19g2000hsx.googlegroups.com...
>
> Hello Folks,
>
> I'm stranded with server downtime (thankfully with net access!) and
> looking to prepare a start on some IDL; can someone tell me please if
> it's possible to include from a FOR loop the variable we are looping
> over in the filename of some kind of file?
>
> eg;
>
> FOR i=0,1 DO BEGIN
> device, filename='i.jpg'
> plot_image, A
> ENDFOR

Others have answered, I just thought I'd add a tip to
include a format='(i3.3)'
command in your string commands, so that you print
out the numbers as 001 002 003. That makes alphabetical
listings go in order, and a bit more convenient to browse
through the files.

Cheers,
bob

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Re: simple query: including loop variable in filename? [message #55904 is a reply to message #55900]

Fri, 14 September 2007 06:29

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Fanning writes:

> Or...
>
> IDL> Print, StrTrim(j,2) + '.jpg'
>
> if you just want to do it in IDL with what's under
> the hood. :-)

Whoops! That article escaped too soon. Here is an
article that goes into more depth on this topic:

http://www.dfanning.com/code_tips/seqfiles.html

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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Re: simple query: including loop variable in filename? [message #55905 is a reply to message #55904]

Fri, 14 September 2007 06:26

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Brian Larsen writes:

> This is the right track but not quite what you want. Doing this has
> a bunch of spaces in the front of the name...
> IDL> print, string(1)+'.jpg'
> 1.jpg
>
> I do this all the time but you need to use trim.pro
> IDL> print, trim(1)+ '.jpg'
> 1.jpg
>
> You can get it here:
> http://sohowww.nascom.nasa.gov/solarsoft/gen/idl/string/trim .pro

Or...

IDL> Print, StrTrim(j,2) + '.jpg'

if you just want to do it in IDL with what's under
the hood. :-)

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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Re: simple query: including loop variable in filename? [message #55906 is a reply to message #55905]

Fri, 14 September 2007 06:00

Brian Larsen
Messages: 270
Registered: June 2006

Senior Member

> j=STRING(i)+'.jpg'
> DEVICE, FILENAME=j

This is the right track but not quite what you want. Doing this has
a bunch of spaces in the front of the name...
IDL> print, string(1)+'.jpg'
1.jpg

I do this all the time but you need to use trim.pro
IDL> print, trim(1)+ '.jpg'
1.jpg

You can get it here:
http://sohowww.nascom.nasa.gov/solarsoft/gen/idl/string/trim .pro

Cheers,

Brian

------------------------------------------------------------ ---------------------
Brian Larsen
Boston University
Center for Space Physics

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Re: simple query: including loop variable in filename? [message #55909 is a reply to message #55906]

Fri, 14 September 2007 04:13

Spon
Messages: 178
Registered: September 2007

Senior Member

On Sep 14, 11:34 am, id6...@googlemail.com wrote:
> Hello Folks,
>
> I'm stranded with server downtime (thankfully with net access!) and
> looking to prepare a start on some IDL; can someone tell me please if
> it's possible to include from a FOR loop the variable we are looping
> over in the filename of some kind of file?
>
> eg;
>
> FOR i=0,1 DO BEGIN
> device, filename='i.jpg'
> plot_image, A
> ENDFOR
>
> so that I can produce filenames 0,1,2..etc.
>
> Thanks,
>
> David.

j=STRING(i)+'.jpg'
DEVICE, FILENAME=j

should do the trick

Chris

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