$title input data Set i 'station' j 'date' k 'time' t 'type' w 'windspeed'; Parameter speed(i,j,k) 'Speed' power_wind(t,w) 'Power assigned to windspeed' power_output(i,j,k,t) 'Power output at every meassuring point for each type' $call csv2gdx station1.txt output=station1.gdx id=speed fieldSep=semiColon index=1,2,3 useHeader=y value=4 storeZero=y $call csv2gdx station2.txt output=station2.gdx id=speed fieldSep=semiColon index=1,2,3 useHeader=y value=4 storeZero=y *...Many stations more $call csv2gdx generator1.txt output=generator1.gdx id=power_wind fieldSep=semiColon index=1,2 useHeader=y value=3 storeZero=y $onMulti $gdxIn station1.gdx $load i = dim1 $load j = dim2 $load k = dim3 $load speed $gdxIn $gdxIn station2.gdx $load i = dim1 $load j = dim2 $load k = dim3 $load speed $gdxIn *...and so on for station 3,4... $gdxIn generator1.gdx $load t = dim1 $load w = dim2 $load power_wind $gdxIn *..and so on for different generators $offMulti *Following won't work due to different dimension *power_output(i,j,k,t) = power_wind(t,speed(i,j,k));