[Help-glpk] The use of printf.

[Berglund Mattias]

Hi everyone!

 

I've got stuck figuring out how to get printf work with my results.
When I use printf I get the following error:

Reading model section from city2.mod...
city2.mod:77: only numeric, symbolic, or logical _expression_ allowed
Context: ...ansfer , <= 20 ; printf { i in PLANTSC } '...' , p_c [ i ] ;
Model processing error

 

 

Where p_c is defined as:

 

var p_c{i in PLANTSC} >=0;

 

and

 

set PLANTSC := VP21 VP22 VP23...

 

but when I look in my result file without the printf statement i get

   No. Column name       Activity     Lower bound   Upper bound
------ ------------    ------------- ------------- -------------
     1 p_c[VP21]              26.667             0
     2 p_c[VP22]              26.667             0
     3 p_c[VP23]              26.667             0
     4 p_c[VP24]              26.667             0
     5 p_c[VP25]              26.667             0
     6 p_c[VP26]              26.667             0
     7 p_c[VP91]                  24             0
     8 p_c[VP92]                  24             0

 

From my point of view I should use

 

printf{i in PLANTSC} "res= %f", p_c[i]

to print the results, but get the silly error.

 

 

Best Regards

Mattias Berglund