GAMS World Forum

Note: Starting with GAMS version 38, GAMSTransfer Matlab is the preferred way to transfer data between Matlab and GAMS. For GDXMRW, I run Matlab on a machine where I have no root privileges so updating the system-wide ''pathdef.m'' is not possible. However, Matlab checks the MATLABPATH environment v...

You are missing ord() operator : https://www.gams.com/latest/docs/UG_OrderedSets.html#UG_OrderedSets_TheOrdOperator ctFreez(p,t,a)$(ord(t)<=2) ..q(p,t,a)=e= q(p,t,a-1) This should work. Same for second question. sum(dt $( (ord(dt) > ord(t)) and (ord(dt) <= ord(t) + lambda)) , ....) - Atharv

There are many many fundamentally wrong things in this piece of code. Brings me back to my initial comment "what do you mean by "positive value of NVS equal to "LVS"" if you already have a value, do you want to reset it? Do you already have values for NVS?" Parameter LV...

Equation
Capacity(n) 'maximum mining capacity';
Capacity(n).. s(n) =l= Capacity1(n);

Check this for more details.https://www.gams.com/latest/docs/UG_Fix ... ors_ErrorG
-Atharv

After solve, variables have much more information than just the solution. They have (.l, .lo, .up, .scale, .m). Please take a look at variable attributes for more details: https://www.gams.com/latest/docs/UG_Variables.html#UG_Variables_VariableAttributes When you just write variablename, GAMS does n...

Sujit,
can you attach a minimal example reproducing this issue?
Does this work for you? Do you see parameter p in the gdx resulting gdx file after running the above program?

- Atharv

Looks like all these are parameters. You don't need =e= type equations for this. This are simply assignments like you do in a normal program. what do you mean by "positive value of NVS equal to "LVS"" if you already have a value, do you want to reset it? Do you already have value...

Hi, I suggest using .val only if set elements are numbers. So now in your code, I see set t/t0*t100/ and you are using t.val. This does not make sense. Please keep your set t to be /0*100/ if you want to use .val. Besides, the errors you see now are just the repeat of your previous errors. The varia...

Fixed the typo. It should be x(i,j,t).
- atharv

I see the problem. You are trying to access variables by parameters. x(v(m)) makes no sense to GAMS as v(m) is not even set. Just because v(m) is 1, does not mean it is 1 that is contained in the set i. One easy way to see why this is flawed is following: If you rename the set i /1*10/ to be i /i1*i...