symbolic equation redefined

GAMS
1

HI! I am quite new to GAMS,
I want to write an equation, but the equation is different for different index. I’ve tried something like this, but GAMS seems to deny a specific index in an equation, does anyone know to go around this?

Code:
house (i,t) consumption house i hour t ;

house(‘one’,t) … A(‘one’,t) =e= A(‘one’,t-1)±sum(j,B(‘one’,j,t))-C(‘two’,t)+D(‘two’);
house(‘two’,t) … A(‘two’,t) =e= A(‘two’,t-1)±sum(j,B(‘two’,j,t))-D(‘four’);

when i do this i get error 150 “Symbolic equation redefined”

thank you!

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2

Hey…

I have been facing the same problem…
Hopefully you might have figure out by now… Can you tell me how to resolve this same problem…

Thanx

On Sunday, March 15, 2015 at 6:02:50 PM UTC+5:30, Anna Cisneros wrote:

HI! I am quite new to GAMS,
I want to write an equation, but the equation is different for different index. I’ve tried something like this, but GAMS seems to deny a specific index in an equation, does anyone know to go around this?

Code:
house (i,t) consumption house i hour t ;

house(‘one’,t) … A(‘one’,t) =e= A(‘one’,t-1)±sum(j,B(‘one’,j,t))-C(‘two’,t)+D(‘two’);
house(‘two’,t) … A(‘two’,t) =e= A(‘two’,t-1)±sum(j,B(‘two’,j,t))-D(‘four’);

when i do this i get error 150 “Symbolic equation redefined”

thank you!

–
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3

Hi Swapnil

You could add -conditions on the right side while keeping just one equation (assuming that the set of houses is /one, two, three, four/). \ \ \ house(i,t) .. A(i,t) =e= A(i,t-1)-sum(j,B(i,j,t))-(C('two',t)+ D('two'))(ord(i) eq 1)- D(‘four’)$(ord(i) eq 2) ;



In the case of house “one” only the term C(“two”,t) + D(“two”) is subtracted. In the case of house “two” the term D(“four”) is subtracted.



You could also use $samesas(i, “one”) and $sameas(i,”two)



Cheers

Renger



From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of Swapnil Rayal
Sent: Dienstag, 3. November 2015 07:50
To: gamsworld
Subject: Re: symbolic equation redefined



Hey…



I have been facing the same problem…

Hopefully you might have figure out by now… Can you tell me how to resolve this same problem…



Thanx

On Sunday, March 15, 2015 at 6:02:50 PM UTC+5:30, Anna Cisneros wrote:

HI! I am quite new to GAMS,

I want to write an equation, but the equation is different for different index. I’ve tried something like this, but GAMS seems to deny a specific index in an equation, does anyone know to go around this?



Code:

house (i,t) consumption house i hour t ;



house(‘one’,t) … A(‘one’,t) =e= A(‘one’,t-1)±sum(j,B(‘one’,j,t))-C(‘two’,t)+D(‘two’);

house(‘two’,t) … A(‘two’,t) =e= A(‘two’,t-1)±sum(j,B(‘two’,j,t))-D(‘four’);



when i do this i get error 150 “Symbolic equation redefined”



thank you!

–
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For more options, visit https://groups.google.com/d/optout.

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