syntax error

[Milan Marinkovic]

Can anyone tell me where is error on this constrain:

subject to fleet {i in day, j in J}: sum{j in J} y[i,j] <= S;

syntax error

param:

set S;

set J;

set day;

variable:

var y {i in day, j in J} integer;

function:

minimize Z: sum {i in 1..7, j in J, k in J} (F[j,k] * b[i,j,k] + V[j,k] * x[i,j,k]);

[Victor Zverovich]

You have identically named dummy indices "j" in indexing expressions with overlapping scopes, {..., j in J} and {j in J}. Rename one of the indices or remove one of the indexing expression if it is not used, e.g.

  subject to fleet {i in day}: sum{j in J} y[i,j] <= S;

HTH,

Victor

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[Milan Marinkovic]

I have one more question, when I input model and data files and try to run it there is an error:

Error executing "solve" command:

error processing param F:

21 invalid subscripts discarded:

F['m1','Y1']

F['m1','Y2']

F['m1','Y3']

and 18 more.

Error executing "solve" command:

error processing param V:

21 invalid subscripts discarded:

V['m1','Y1']

V['m1','Y2']

V['m1','Y3']

and 18 more.

Error executing "solve" command:

error processing param G:

9 invalid subscripts discarded:

G['Y1','Y1']

G['Y1','Y2']

G['Y1','Y3']

and 6 more.

Error executing "solve" command:

error processing objective Z:

no value for F['Y1','Y1']

Can you help me how to solve it?

[Robert Fourer]

You are seeing "invalid subscripts discarded" error messages because your data does not correspond to the indexing of your variables. For example you have

param F {j in J, k in K};

so the first subscript of F should be from J and the second subscript of F should be from K. In your data the sets are given by

set J := Y1 Y2 Y3 ;
set K := Y1 Y2 Y3 ;
set S := m1 m2 m3 m4 m5 m6 m7;

But the data for F is specified by

param F: Y1 Y2 Y3 :=
m1 6 7 3
m2 5 5 2
m3 5 4 2
m4 4 4 2
m5 5 3 1
m6 7 7 2
m7 5 9 2;

which shows the first subscript coming from S rather than from J.

Bob Fourer
am...@googlegroups.com

=======

[Milan Marinkovic]

I solve that problem, thank you, but there is another one:

Error executing "solve" command:

error processing objective Z:

invalid subscript b[1,'Y1','Y1']

Can you help me with this? 

[Robert Fourer]

It appears that you wrote "set day := 7;" in your data, so that 1 is not a member of set day, and b[1,'Y1','Y1'] is not defined. Try "set day := 1 2 3 4 5 6 7;".

Bob Fourer
am...@googlegroups.com

=======

From: am...@googlegroups.com [mailto:am...@googlegroups.com] On Behalf Of Milan Marinkovic
Sent: Monday, November 23, 2015 5:12 PM
To: AMPL Modeling Language