Does anybody know if it is possible to fit multiple data sets simultaneously in IDL. I am currently using "curvefit" to sequentially fit 3 datasets, but these datasets influence eachother, so I am looking for a more appropriate function. It is basically a 3 compartment model, with interaction from one main compartment with the two others, but the two others do not interact. I have time varying data for all 3 compartments, and I want to fit the kinetic parameters of the 3 compartment model with both forward and reverse rate constants. Can this be done using IDL?