Re: [Help-glpk] cannot convert 1..720 to floatin-point number

[Meketon, Marc]

The issue is that set’s contain objects (like numbers, strings, other sets).  They are not considered as really having numeric entries.  But param’s do.  So the trick is to create a param array that translates the object in the set to the numeric value.

 

Try (look for the red bold where the param array tt is used):

 

param tmax;

set T:= 1..tmax;

param tt{t in T} := t;

 

…

subject to PrecTemp{i in A,j in A}: sum{t in T} tt[t]*x[j,t] >= sum{t in T} tt[t]*x[i,t] + d[i] ;

 

data;

param tmax := 720;

end;

 

From: help-glpk-bounces+address@hidden [mailto:help-glpk-bounces+address@hidden On Behalf Of Daniele Micarelli
Sent: Tuesday, July 03, 2012 7:38 AM
To: address@hidden; address@hidden; address@hidden; address@hidden
Subject: [Help-glpk] cannot convert 1..720 to floatin-point number

 

 [Help-glpk] cannot convert 1..720 to floatin-point number

tried the recommended changes, but nothing to do

the error "cannot convert 1..720 to floatin-point number" occurs in the bond "subject to PrecTemp{i in A,j in A}: sum{t in T} t*x[j,t] >= sum{t in T} t*x[i,t] + d[i] ;  /* vincolo precedenze temporali */ "

x[i,t] is the variable
d[i] is the numeric parameter

thank yuo very much

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