Different gdx generated from individual unload and execute_unload

[Archiver]

Hi all: I may have come into contact with a bug:

In a file I run I'm experiencing the following:

$gdxout aGDXFile.gdx
$unload aSymbol anotherSymbol
$gdxout

Generates an erroneous gdx file which has some empty symbols. Previous displaying shows they are not empty, and when I do

execute_unload aGDXFile.gdx

The generated gdx has all symbols proper.

Is there any condition under which this could happen ?

Regards
Claudio

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[Archiver]

Claudio,

$unload exports the symbol with the data from the declaration (the data between / /) at compile time, execute_unload exports the data after all execution time calculations (up to this point). Display shows the data at execution time. So in the following example:

set i /1*10/, ii(i) /2,4,6,8,10/;
ii(i) = mod(ord(i),2);
execute_unload 'exec', ii;
$gdxout comp
$unload ii
$gdxout

comp.gdx will have ii with all even i (2,4,6,8,10), while exec.gdx has an ii with all i with an odd ordinal number (1,3,5,7,9). So clearly there are situations as you describe.

Hope this helps,
Michael Bussieck - GAMSWorld Coordinator

On Friday, February 5, 2016 at 9:09:25 AM UTC-5, Claudio Delpino wrote:

Hi all: I may have come into contact with a bug:

In a file I run I'm experiencing the following:

$gdxout aGDXFile.gdx
$unload aSymbol anotherSymbol
$gdxout

Generates an erroneous gdx file which has some empty symbols. Previous displaying shows they are not empty, and when I do

execute_unload aGDXFile.gdx

The generated gdx has all symbols proper.

Is there any condition under which this could happen ?

Regards
Claudio

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[Archiver]

Michael: Thanks! How could I overlook the difference between compile phase and execution phase ?. Sorry !!!

Regards
Claudio

On Fri, Feb 5, 2016 at 11:42 AM, Michael Bussieck wrote:

Claudio,

$unload exports the symbol with the data from the declaration (the data between / /) at compile time, execute_unload exports the data after all execution time calculations (up to this point). Display shows the data at execution time. So in the following example:

set i /1*10/, ii(i) /2,4,6,8,10/;
ii(i) = mod(ord(i),2);
execute_unload 'exec', ii;
$gdxout comp
$unload ii
$gdxout

comp.gdx will have ii with all even i (2,4,6,8,10), while exec.gdx has an ii with all i with an odd ordinal number (1,3,5,7,9). So clearly there are situations as you describe.

Hope this helps,
Michael Bussieck - GAMSWorld Coordinator


On Friday, February 5, 2016 at 9:09:25 AM UTC-5, Claudio Delpino wrote:

Hi all: I may have come into contact with a bug:

In a file I run I'm experiencing the following:

$gdxout aGDXFile.gdx
$unload aSymbol anotherSymbol
$gdxout

Generates an erroneous gdx file which has some empty symbols. Previous displaying shows they are not empty, and when I do

execute_unload aGDXFile.gdx

The generated gdx has all symbols proper.

Is there any condition under which this could happen ?

Regards
Claudio

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