problem with undefined observations

[Archiver]

I am calculate some índices of exportation, but the GAMS is Reading like undefined the obsevatons that not be in my sample, when the country doesn’t export to other country of my sample. This is resulting in some erros of the program when I divide a number by the other number that is undefined (zero), or I multiply, or I make the log, or I use this number with expoente.


I would like to know what I need to do for the GAMS doesn’t read this undefineds observations.



I already transform the unefined on scalar, but this problem isn’t resolve.

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[Archiver]

Hi Anacarolina

Take a good look at the $-sign in the manual.

Example:

set i /1*5/;

parameter b(i), c(i);

b("1") = 1; b("2") = 1;

c(i)$b(i) = 1/b(i);

cheers

Renger


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From: gamsworld@googlegroups.com [gamsworld@googlegroups.com] on behalf of anacarolina.alimg@gmail.com [anacarolina.alimg@gmail.com]
Sent: Sunday, February 14, 2016 14:05
To: gamsworld
Subject: problem with undefined observations

I am calculate some índices of exportation, but the GAMS is Reading like undefined the obsevatons that not be in my sample, when the country doesn’t export to other country of my sample. This is resulting in some erros of the program when I divide a number by the other number that is undefined (zero), or I multiply, or I make the log, or I use this number with expoente.


I would like to know what I need to do for the GAMS doesn’t read this undefineds observations.



I already transform the unefined on scalar, but this problem isn’t resolve.

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