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0

I have this data file:

param: name car pro fat vit cal :=
 1 'Fiddleheads' 3 1 0 3 80
 2 'Fireweed Shoots' 3 0 0 4 150
 3 'Prickly Pear Fruit' 2 1 1 3 190
;

and this model:

set I;
set J;

param nameI symbolic;

param carI integer >= 0;
param proI integer >= 0;
param fatI integer >= 0;
param vitI integer >= 0;
param calI integer >= 0;
param nuti in I, J = (car[i], pro[i], fat[i], vit[i]);

The last line is invalid:

mod, line 10 (offset 176):
 syntax error
context: param nuti in I, J = >>> (car[i], <<< pro[i], fat[i], vit[i]);

but I don't know how to get an equivalent working. Essentially, I want to form a 3,4 array based on a literal expression. I've tried a handful of different syntaxes both in the data and model file and haven't been able to get any working.

ampl

share|improve this question

asked Mar 25 at 16:34

ReinderienReinderien

6,22422 gold badges3131 silver badges5858 bronze badges

add a comment | 

0

I have this data file:

param: name car pro fat vit cal :=
 1 'Fiddleheads' 3 1 0 3 80
 2 'Fireweed Shoots' 3 0 0 4 150
 3 'Prickly Pear Fruit' 2 1 1 3 190
;

and this model:

set I;
set J;

param nameI symbolic;

param carI integer >= 0;
param proI integer >= 0;
param fatI integer >= 0;
param vitI integer >= 0;
param calI integer >= 0;
param nuti in I, J = (car[i], pro[i], fat[i], vit[i]);

The last line is invalid:

mod, line 10 (offset 176):
 syntax error
context: param nuti in I, J = >>> (car[i], <<< pro[i], fat[i], vit[i]);

but I don't know how to get an equivalent working. Essentially, I want to form a 3,4 array based on a literal expression. I've tried a handful of different syntaxes both in the data and model file and haven't been able to get any working.

ampl

share|improve this question

asked Mar 25 at 16:34

ReinderienReinderien

6,22422 gold badges3131 silver badges5858 bronze badges

add a comment | 

I have this data file:

param: name car pro fat vit cal :=
 1 'Fiddleheads' 3 1 0 3 80
 2 'Fireweed Shoots' 3 0 0 4 150
 3 'Prickly Pear Fruit' 2 1 1 3 190
;

and this model:

set I;
set J;

param nameI symbolic;

param carI integer >= 0;
param proI integer >= 0;
param fatI integer >= 0;
param vitI integer >= 0;
param calI integer >= 0;
param nuti in I, J = (car[i], pro[i], fat[i], vit[i]);

The last line is invalid:

mod, line 10 (offset 176):
 syntax error
context: param nuti in I, J = >>> (car[i], <<< pro[i], fat[i], vit[i]);

but I don't know how to get an equivalent working. Essentially, I want to form a 3,4 array based on a literal expression. I've tried a handful of different syntaxes both in the data and model file and haven't been able to get any working.

ampl

share|improve this question

asked Mar 25 at 16:34

ReinderienReinderien

6,22422 gold badges3131 silver badges5858 bronze badges

param: name car pro fat vit cal :=
 1 'Fiddleheads' 3 1 0 3 80
 2 'Fireweed Shoots' 3 0 0 4 150
 3 'Prickly Pear Fruit' 2 1 1 3 190
;

set I;
set J;

param nameI symbolic;

param carI integer >= 0;
param proI integer >= 0;
param fatI integer >= 0;
param vitI integer >= 0;
param calI integer >= 0;
param nuti in I, J = (car[i], pro[i], fat[i], vit[i]);

mod, line 10 (offset 176):
 syntax error
context: param nuti in I, J = >>> (car[i], <<< pro[i], fat[i], vit[i]);

share|improve this question

asked Mar 25 at 16:34

ReinderienReinderien

6,22422 gold badges3131 silver badges5858 bronze badges

share|improve this question

asked Mar 25 at 16:34

ReinderienReinderien

6,22422 gold badges3131 silver badges5858 bronze badges

asked Mar 25 at 16:34

ReinderienReinderien

6,22422 gold badges3131 silver badges5858 bronze badges

asked Mar 25 at 16:34

ReinderienReinderien

6,22422 gold badges3131 silver badges5858 bronze badges

1 Answer
1

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oldest

votes

1

Model:

set names;
set components;
param nutnames,components default 0;

Data:

set names := 
Fiddleheads
'Fireweed Shoots' 
'Prickly Pear Fruit';

set components := car pro fat vit cal
;

param nut :=
[Fiddleheads,*] 
car 3 pro 1 vit 3 cal 80
['Fireweed Shoots',*]
car 3 vit 4 cal 150
['Prickly Pear Fruit',*]
car 2 pro 1 fat 1 vit 3 cal 190
;

See Chapter 9 of the AMPL Book for variants.

The "default 0" option avoids the need to explicitly list zero values, which can be useful for sparse data sets.

It would be useful to have an AMPL input format that allows a 2-D parameter to be specified in a simple table layout with row and column headers, along the lines of your data step, but I'm not aware of one that does this.

share|improve this answer

answered Mar 27 at 0:37

Geoffrey BrentGeoffrey Brent

1,00511 gold badge88 silver badges1010 bronze badges

add a comment | 

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1

Model:

set names;
set components;
param nutnames,components default 0;

Data:

set names := 
Fiddleheads
'Fireweed Shoots' 
'Prickly Pear Fruit';

set components := car pro fat vit cal
;

param nut :=
[Fiddleheads,*] 
car 3 pro 1 vit 3 cal 80
['Fireweed Shoots',*]
car 3 vit 4 cal 150
['Prickly Pear Fruit',*]
car 2 pro 1 fat 1 vit 3 cal 190
;

See Chapter 9 of the AMPL Book for variants.

The "default 0" option avoids the need to explicitly list zero values, which can be useful for sparse data sets.

It would be useful to have an AMPL input format that allows a 2-D parameter to be specified in a simple table layout with row and column headers, along the lines of your data step, but I'm not aware of one that does this.

share|improve this answer

answered Mar 27 at 0:37

Geoffrey BrentGeoffrey Brent

1,00511 gold badge88 silver badges1010 bronze badges

add a comment | 

1

Model:

set names;
set components;
param nutnames,components default 0;

Data:

set names := 
Fiddleheads
'Fireweed Shoots' 
'Prickly Pear Fruit';

set components := car pro fat vit cal
;

param nut :=
[Fiddleheads,*] 
car 3 pro 1 vit 3 cal 80
['Fireweed Shoots',*]
car 3 vit 4 cal 150
['Prickly Pear Fruit',*]
car 2 pro 1 fat 1 vit 3 cal 190
;

See Chapter 9 of the AMPL Book for variants.

The "default 0" option avoids the need to explicitly list zero values, which can be useful for sparse data sets.

It would be useful to have an AMPL input format that allows a 2-D parameter to be specified in a simple table layout with row and column headers, along the lines of your data step, but I'm not aware of one that does this.

share|improve this answer

answered Mar 27 at 0:37

Geoffrey BrentGeoffrey Brent

1,00511 gold badge88 silver badges1010 bronze badges

add a comment | 

Model:

set names;
set components;
param nutnames,components default 0;

Data:

set names := 
Fiddleheads
'Fireweed Shoots' 
'Prickly Pear Fruit';

set components := car pro fat vit cal
;

param nut :=
[Fiddleheads,*] 
car 3 pro 1 vit 3 cal 80
['Fireweed Shoots',*]
car 3 vit 4 cal 150
['Prickly Pear Fruit',*]
car 2 pro 1 fat 1 vit 3 cal 190
;

See Chapter 9 of the AMPL Book for variants.

The "default 0" option avoids the need to explicitly list zero values, which can be useful for sparse data sets.

It would be useful to have an AMPL input format that allows a 2-D parameter to be specified in a simple table layout with row and column headers, along the lines of your data step, but I'm not aware of one that does this.

share|improve this answer

answered Mar 27 at 0:37

Geoffrey BrentGeoffrey Brent

1,00511 gold badge88 silver badges1010 bronze badges

set names;
set components;
param nutnames,components default 0;

set names := 
Fiddleheads
'Fireweed Shoots' 
'Prickly Pear Fruit';

set components := car pro fat vit cal
;

param nut :=
[Fiddleheads,*] 
car 3 pro 1 vit 3 cal 80
['Fireweed Shoots',*]
car 3 vit 4 cal 150
['Prickly Pear Fruit',*]
car 2 pro 1 fat 1 vit 3 cal 190
;

share|improve this answer

answered Mar 27 at 0:37

Geoffrey BrentGeoffrey Brent

1,00511 gold badge88 silver badges1010 bronze badges

answered Mar 27 at 0:37

Geoffrey BrentGeoffrey Brent

1,00511 gold badge88 silver badges1010 bronze badges

answered Mar 27 at 0:37

Geoffrey BrentGeoffrey Brent

1,00511 gold badge88 silver badges1010 bronze badges