Getting Real Number Expected Error

GAMS
1

Hello all,

I am working on a project and want string values as parameters as compared to real numbers but seems like GAMS does not support this.

sets i /may,july,june/
j /UP,MP,HP/
k /Winter,Summer/;

Parameter ProductType(i,j,k)
/may.UP.Winter Grains
july.HP.Summer Rice
/;

So, can anybody please tell me if there is a way to pass string values in a parameter in GAMS.

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2

Hi Shash



You can add the line



Acronym Grains, Rice;



Before your table and it should compile. But you must think carefully about what you want to do with your parameter before continuing.



Alternative it to use a multidimensional set:



Set G / grain, Rice /

Set ProductType(i,j,k,g)

/may.UP.Winter.Grains

july.HP.Summer.Rice

/;



Good luck



Arne


\

Arne Stolbjerg Drud

ARKI Consulting & Development A/S

Bagsvaerdvej 246A, DK-2880 Bagsvaerd, Denmark

Phone: (+45) 44 49 03 23, Fax: (+45) 44 49 03 33, email: adrud@arki.dk



From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of shash
Sent: Thursday, July 10, 2014 3:00 PM
To: gamsworld@googlegroups.com
Subject: Getting Real Number Expected Error



Hello all,



I am working on a project and want string values as parameters as compared to real numbers but seems like GAMS does not support this.



sets i /may,july,june/

j /UP,MP,HP/

k /Winter,Summer/;



Parameter ProductType(i,j,k)

/may.UP.Winter Grains

july.HP.Summer Rice

/;



So, can anybody please tell me if there is a way to pass string values in a parameter in GAMS.

–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
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For more options, visit https://groups.google.com/d/optout.

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3

Hi there,

I am trying to replace numbers with EDD below and i keep getting the “Real number expected” error. EDD contains a real number.

"
EDD = ED(‘2050’)/30;

Table BusData(bus,*)
Pd
1 EDD
2 291.12
3 291.12
4 291.12;
"

4

Understand the difference between GAMS compilation and execution, see https://www.gams.com/latest/docs/UG_GamsCall.html#UG_GamsCall_TwoPass. The data of a table statement is compiled before GAMS executes EDD = ED(‘2050’)/30; So what you try to do makes no sense in a GAMS context. You can assign (execution time) the value EDD at execution time: BusData(‘1’,‘Pd’) = EDD; Just leave the data statement for bus 1 out of the table data.

-Michael

5

Thank you, Michael.

The plan is to have all busses assigned an EDD value. When EDD changes, all values in the assignment changes, rather than changing values manually.

What I have:

Table BusData(bus,*)
Pd
1 291.12
2 291.12
3 291.12
4 291.12;

What I intend to have:

Table BusData(bus,*)
Pd
1 EDD
2 EDD
3 EDD
4 EDD;

The value for EDD has been precalculated. kindly assist.