GAMS World Forum

Hi, You could for example first create a list of the exitsing fuel type csv files. That list can be handled as subset of all the fuel types. Once you know that subset, you can loop over it to call csv2gdx and load the data from gdx only for the existing files, e.g. *create some dummy csv files for t...

Hi, you should always check the model and solver status. S O L V E S U M M A R Y MODEL Rede OBJECTIVE cost TYPE MINLP DIRECTION MINIMIZE SOLVER SBB FROM LINE 122 **** SOLVER STATUS 4 Terminated By Solver **** MODEL STATUS 9 Intermediate Non-Integer **** OBJECTIVE VALUE 7.0711 Intermediate non-intege...

For example as a part of an optimization problem I need to calculate the electricity generation cost from different types of plant by this formula : generation*fuel_price. But for different fuels the price varies so even though the variable generation's name is same but should be used with differen...

Hi,

To cut it short, no.
Maybe you can provide a more elaborate example why you would want to do that. That might be helpful to suggest alternatives.

Best,
Fred

Hi, if you want to incorporate the solution time in report parameter xcostx, you could do for example xcostX(scenario,'%1',solnpool,'TIME','','','') = EOGLSP.resusd; This gives the time the solver took for a solve statement. I don't think that you can access the information at what time of a solve a...

Enrique, In your latest example there are 4 solve statements. You loop over 2 scenarios and for every scenario you solve the model twice. It seems that in readsoln.gms you are computing some sort of report parameter xcostX. You could give this parameter additional indices for scenario and 1st/2nd so...

Hi, With CPLEX (the log tells me that you use CPLEX) you can update the solver option file. I attached an example based on model dice from the GAMS model library and the trigger file example from the support wiki. Cplex starts with optcr=0.01, after ~10 seconds it uses a cplex.op2 with optcr=0.1 and...

Hi,

GAMS comes with a stochastic library that allows you draw random numbers from the beta distribution: https://www.gams.com/latest/docs/UG_Ext ... ticLibrary

I hope this helps!

Fred

If I run parameter VD0, VINTCD0, VFACD0, VF0, VINTCF0, VFACF0, TAXM0, VT0, TN, VQH0, QG, QINV, FSAVD0, FSAVF0, FSAVK0, SIGMA, GAMMA, SIGMAP, ITA; $call gdxxrw FRICTION.xlsx @FRICTION.txt $gdxin FRICTION.gdx $load VD0 VINTCD0 VFACD0 VF0 VINTCF0 VFACF0 TAXM0 VT0 TN VQH0 QG QINV FSAVD0 FSAVF0 FSAVK0 SI...

Hi,

As I wrote in my previous post, the line numbers refer to the echo print in the lst file.
Looking up the lines and checking the data, there is obviously a division by zero.

Best,
Fred