Is it possible to use $Eval and $Ifthen with parameter values?

GAMS
1

Dear all,

I have not been able to find any example where $Eval and $Ifthen are used using parameter values imported from Excel. For example if I try the following code:

  • Both parameters “years” and “years_limit” are imported from excel
    parameter years, years_limit;
    years = 12;
    years_limit = 15;

$Set Nyrs
$Eval Nyrs years

parameter test;
test = %Nyrs%;

$Ifthen.one “%Nyrs%” < years_limit
test = years_limit;
$Endif.one

display test;

I get an error that says: “Error 659 … Error in evaluation”. Any help on this issue is more than welcome.

Thanks in advance for your help,


Sincerely yours,
Pedro

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2

Dear all,

Any suggestions or ideas on this issue?


Thanks in advance for your help,


Sincerely yours,
Pedro


On Mon, Mar 3, 2014 at 1:03 PM, PowerChile wrote:

Dear all,

I have not been able to find any example where $Eval and $Ifthen are used using parameter values imported from Excel. For example if I try the following code:

  • Both parameters “years” and “years_limit” are imported from excel
    parameter years, years_limit;
    years = 12;
    years_limit = 15;

$Set Nyrs
$Eval Nyrs years

parameter test;
test = %Nyrs%;

$Ifthen.one “%Nyrs%” < years_limit
test = years_limit;
$Endif.one

display test;

I get an error that says: “Error 659 … Error in evaluation”. Any help on this issue is more than welcome.

Thanks in advance for your help,


Sincerely yours,
Pedro

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\

PEDRO JAVIER RAMÍREZ TORREALBA
Ingeniero Civil Eléctrico PUC
MSc en Ingeniería Eléctrica PUC
Londres, REINO UNIDO

Celular: +44-(0)75-8069-3119

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