| IDL Version Number Warning [message #61653] |
Thu, 24 July 2008 11:30  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
I attended another of the useful seminar's ITTVIS puts
on periodically in Boulder in morning. These have been
mostly free of marketing hype and full of good information
generally. I think they are a real service to the user
community. Today's topic was extending ENVI with IDL,
taught (thank goodness!) at a basic enough level
even I could understand most of it.
ENVI is a hell of a program. There is no denying that.
But every time I see that image group I think, well,
shoot, I could write that, and maybe I will one of these
days. :-)
Anyway, I learned in the seminar about a version numbering
issue that is sure to cause someone grief sooner or
later. Last week ITTVIS announced formally that IDL
7.0.3 was available for download. Some of you have
probably already downloaded this, as it has been available
for 4-5 weeks, at least.
I noticed today that after downloading and installing the
update that my IDL Workbench reports that I am at version
7.0.3, but if I print, !Version.Release it prints 7.0.1.
As I understand it from a technical person at ITTVIS, there
is a distinction between the *workbench* version and the IDL
version, even though new IDL code was added in IDL 7.0.3, or
whatever the hell it is suppose to be called.
In my line of work (I.e., IDL programming), there is often
considerable need to know exactly which version of IDL you
are working with. Not being able to rely on what I am being
told by system variables is not going to make my life any
easier. In fact, it could be another of those items in my
personal "Reasons to Switch to MatLab" list.
Perhaps someone at ITTVIS can give us the low-down on the
strange logic of this situation.
Cheers,
David
P.S. Did I mention that every time I attend an IDL seminar my
opinion of iTools gets worse? (I didn't even realize this was
possible!)
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: IDL version [message #65781 is a reply to message #61653] |
Thu, 19 March 2009 08:41  |
Nigel Wade
Messages: 286
Registered: March 1998
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Senior Member |
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llo wrote:
> How can I know which version of IDL is running my program ?
> llo
The !version system variable holds this information:
IDL> help,/struct,!version
** Structure !VERSION, 8 tags, length=104, data length=100:
ARCH STRING 'x86_64'
OS STRING 'linux'
OS_FAMILY STRING 'unix'
OS_NAME STRING 'linux'
RELEASE STRING '6.2'
BUILD_DATE STRING 'Jun 20 2005'
MEMORY_BITS INT 64
FILE_OFFSET_BITS
INT 64
Depending on exactly what you want, maybe !version.release
--
Nigel Wade
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| Re: IDL version [message #65782 is a reply to message #61653] |
Thu, 19 March 2009 08:41 |
Maarten[1]
Messages: 176
Registered: November 2005
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Senior Member |
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On Mar 19, 4:22 pm, llo <bernat.puigdomen...@gmail.com> wrote:
> How can I know which version of IDL is running my program ?
The !VERSION structure system variable contains the information you
need, and then some.
IDL> help, !VERSION, /structure
shows you the fields that are available.
Maarten
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| Re: IDL version [message #65783 is a reply to message #61653] |
Thu, 19 March 2009 08:40 |
ben.bighair
Messages: 221
Registered: April 2007
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Senior Member |
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On Mar 19, 11:22 am, llo <bernat.puigdomen...@gmail.com> wrote:
> How can I know which version of IDL is running my program ?
> llo
Hello,
When you start up IDL it will print version info...
[Sei:~] Ben% idl
IDL Version 6.3, Mac OS X (darwin ppc m32). (c) 2006, Research
Systems, Inc.
Installation number: 99906.
Licensed for personal use by Michael Sieracki only.
All other use is strictly prohibited.
To get the version programmatically you can access the "release" tag
of the !version system variable.
IDL> help, !version,/str
** Structure !VERSION, 8 tags, length=76, data length=76:
ARCH STRING 'ppc'
OS STRING 'darwin'
OS_FAMILY STRING 'unix'
OS_NAME STRING 'Mac OS X'
RELEASE STRING '6.3'
BUILD_DATE STRING 'Mar 23 2006'
MEMORY_BITS INT 32
FILE_OFFSET_BITS
INT 64
You'll see programmers doing stuff like...
IDL> if (!version.release LT 7) then print, "old duffer"
old duffer
IDL's string-to-float conversion seems to handle the oddball release
format you might see...
IDL> if ('7.0.4' LT 7.0) then print, "old duffer"
Cheers,
Ben
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