----- Original Message ----
From: Andrew Makhorin <[EMAIL PROTECTED]>
To: Louis Luangkesorn <[EMAIL PROTECTED]>
Cc: [email protected]
Sent: Saturday, July 1, 2006 3:31:55 PM
Subject: Re: [Help-glpk] reading in GMPL file questions
Where is lpx_create_index documented? I am using refman V4.8 and it is not included? Is there a source code file that implements it and has details of the interface?From: Andrew Makhorin <[EMAIL PROTECTED]>
To: Louis Luangkesorn <[EMAIL PROTECTED]>
Cc: [email protected]
Sent: Saturday, July 1, 2006 3:31:55 PM
Subject: Re: [Help-glpk] reading in GMPL file questions
>
> 2. Is the order of the rows always correspond to the order in the
> model file? I would like to be able to programmatically modify
> rows, but this requires I be able to predict where the row is based
> on the model file.
> No, the order in which the translator produces rows and columns is
> unpredictable. Once you have read the model via lpx_read_model, you
> should call the api routine lpx_create_index to index rows and columns
> by their symbolic names, and then use the routines lpx_find_row and
> lpx_find_col to determine ordinal numbers of rows/columns.
> Andrew Makhorin
> 2. Is the order of the rows always correspond to the order in the
> model file? I would like to be able to programmatically modify
> rows, but this requires I be able to predict where the row is based
> on the model file.
> No, the order in which the translator produces rows and columns is
> unpredictable. Once you have read the model via lpx_read_model, you
> should call the api routine lpx_create_index to index rows and columns
> by their symbolic names, and then use the routines lpx_find_row and
> lpx_find_col to determine ordinal numbers of rows/columns.
> Andrew Makhorin
Louis
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