Re: [Help-glpk] [Fwd: Read Excel data into subscripted set]

[Xypron]

Hello Christian,

your mail had to be forwarded manually because you are not subscribed to
the GLPK help list.
See https://lists.gnu.org/mailman/listinfo/help-glpk

Two dimensional tables cannot be read by GMPL. Organize your data in
columns:
NUTR, FOOD, amt
Vitamin C, Hamburger, 0
Water, Wine, 0.93

glpk-4.47/doc/gmpl.pdf provides the syntax. GLPK for Windows has example
files in glpk-4.47/examples/sql.

Best regards

Xypron

On 26.10.2012 15:27, Andrew Makhorin wrote:
> -------- Forwarded Message --------
> Subject: Read Excel data into subscripted set
> Date: Fri, 26 Oct 2012 14:46:44 +0200
>
> Hi,
>
> I have troubles with reading a 2-dimensional table in MS Excel and
> putting the data into a subscripted set. In a first step, I try to read
> a 2-dimensional table and fill its data into a 2-dimensional parameter.
> The example from the AMPL book pp.196-197 (can be found online:
> http://www.ampl.com/BOOK/CHAPTERS/13-tables.pdf) describes exactly this
> situation. It uses the diet problem to demonstrate, how the parameter
> amt (param amt {NUTR,FOOD} >= 0) can be read from MS Excel by 
> table dietAmts IN "ODBX" DIET2D.xls":
> [i ~ NUTR], {j in FOOD} <amt[i,j] ~ (j)>;
>
>
>
> Since the database connection in GMPL looks a little bit different, I
> adopted my working command for reading in the data of a 1-dimensional MS
> Excel table to the 2-dimensional case like that:
> table dietAmts IN 'ODBC'
>   'DRIVER={Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm,
> *.xlsb)};dbq=.\test.xlsx'
>   'SELECT * FROM [Tabelle2$]' :
>   [i ~ NUTR], {j in FOOD} <amt[i,j] ~ (j)>;
>
> Putting everything together in one model file (why the table definition
> needs to be before the data part, I still do not understand..), Gusek
> gives me an error message:
> syntax error in field list
> Context:  , FOOD } >= 0 ; table dietAmts IN '...' '...' '...' : [ i ~
> MathProg model processing error
>
> I would appreciate every help!
>
> Regards,
> Christian
>
>
>
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