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COMMON block question [message #23576]

Tue, 30 January 2001 07:53

Paul van Delst
Messages: 364
Registered: March 1997

Senior Member

Hey there,

I am doing the following in an initialisation function:

COMMON rtm_transmittance_data, predictor_index, $
transmittance_coefficients

result = read_transmittance_coefficients( 'transmittance_coefficients', $
predictor_index, $
transmittance_coefficients )
IF ( result NE SUCCESS ) THEN $
MESSAGE, 'Error reading transmittance coefficients.', $
/NONAME, /NOPRINT

If I run the function I see the following:

IDL> print, initialize_rtm()
% Compiled module: COMPUTE_ABSORBER_SPACE.
% Compiled module: READ_TRANSMITTANCE_COEFFICIENTS.
% Compiled module: OPEN_COEFFICIENT_FILE.
% Compiled module: READ_SPECTRAL_COEFFICIENTS.
1
IDL> common rtm_transmittance_data
IDL> help
% At $MAIN$
PREDICTOR_INDEX (RTM_TRANSMITTANCE_DATA)
LONG = Array[6, 142, 3]
TRANSMITTANCE_COEFFICIENTS (RTM_TRANSMITTANCE_DATA)
DOUBLE = Array[6, 301, 142, 3]
Compiled Procedures:
$MAIN$

Compiled Functions:
COMPUTE_ABSORBER_SPACE INITIALIZE_RTM OPEN_COEFFICIENT_FILE
READ_SPECTRAL_COEFFICIENTS READ_TRANSMITTANCE_COEFFICIENTS

How does IDL go about creating COMMON blocks when the size/type of the common block
elements are not known until, in this case, they're read in. Understand I'm coming from
Fortran-90 background where I declare everything up front in its own module (sort of like
a f77/IDL common block but better). Does IDL simply create pointers to the data elements
up front and then fills in the blanks after the data has actually been read in/defined?
The documentation doesn't give much info.

Thanks for any insights. All metphysical replies forwarded to DF. :o)

paulv

--
Paul van Delst A little learning is a dangerous thing;
CIMSS @ NOAA/NCEP Drink deep, or taste not the Pierian spring;
Ph: (301) 763-8000 x7274 There shallow draughts intoxicate the brain,
Fax: (301) 763-8545 And drinking largely sobers us again.
Email: pvandelst@ncep.noaa.gov Alexander Pope.

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[Message index]

		COMMON block question By: Paul van Delst on Tue, 30 January 2001 07:53
		Re: common block question By: pgrigis on Thu, 14 April 2011 07:20
		Re: common block question By: oxfordenergyservices on Fri, 15 April 2011 03:02
		Re: common block question By: penteado on Wed, 13 April 2011 16:21
		Re: common block question By: David Fanning on Wed, 13 April 2011 14:17
		Re: common block question By: Paul Van Delst[1] on Fri, 15 April 2011 09:13
		Re: common block question By: penteado on Fri, 15 April 2011 08:33

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