I am modeling with the DICE2016 model of Nordhaus, which code is publicly available here; http://www.econ.yale.edu/~nordhaus/home ... 916ap.gms.
and I desperately need help as I am very inexperienced in GAMS (and time constrained).
Here are 2 (somewhat related) questions;
- I wish to model uncertainty in an altered version of the DICE model, (initially) through one parameter at the time, such as the initial growth rate of TFP, "ga0". I believe the best way to do this is to import an Excel sheet with 10,000 MC-drawn values of ga0 to GAMS, before looping over these scenarios.
Here is my code;
Code: Select all
**Karo tries random generation of ga0 set sc scenarios ; * scenario set implicitly defined via parameter ga0_s parameter ga0_s(sc<); $onecho > file.1.txt dset=sc rng=a1 rdim=1 par=ga0_s rng=Sheet2!a1 rdim=0 cdim=1 $offecho * read data from excel and store in GDX file $call GDXXRW Indata.xlsx trace=3 @file.1.txt $ife errorlevel<>0 $abort Problem with GDXXRW * load data from gdx file $gdxin Indata $load ga0_s $gdxin display sc, ga0_s; parameter report(*,*,*) report parameter * loop over scenarios and updata data as needed loop(sc, ga0 = ga0_s(sc); * update other symbols if there are any in the model that depend ga0 ga(t)=ga0*exp(-dela*5*((t.val-1))); al("1") = a0; loop(t, al(t+1)=al(t)/((1-ga(t)));); solve co2 maximizing utility using nlp; report('scc',t,sc) = -1000*eeq.m(t)/(.00001+cc.m(t)); ); execute_unload 'try1.2.gdx' report; execute 'gdxxrw try1.2.gdx par=report rdim=2 cdim=1' ; abort$(errorlevel<>0) 'problems wirth GDXXRW';
Could someone kindly help me how to specify this, as my output seem to report all the scenarios as one run, and I get several error codes?
- Assuming that I am able to run the model 10,000 times with the different ga0-parameters, I then want to report the output in Excel-format (SCC(t), consumption per capita (t) etc.). Since the runs are so many I wish to tell GAMS to report the output in 100 (smaller) xlsx-files, showing 100 scenarios each, and then compiling them to one additional large one with all the scenarios. I would preferably have both csv- and xlsx-files.
How can I do that?
Thank you so much in advance!