Hello, I am using COMSOL (RF modul) for some time now to calculate the eigenvalues (modes) of optical fibers. So far I changed all the params from hand in the software. But it is getting anoying to change a parameter (the wavelength) and to recalculate if one wants to calculate for many parameters. Later one I want also to chage structural parameters of the microstructured fibers. This means I have to use the skript or matlab to impelment loops and so, rigth? But I have problems getting started. I get always errors and I do not know how to change the postprocessing correspondingly (so that I get all the wavelegth dependent calculated modes). Does anyone have a hit? Are there good tutorials? Has anyone a example m-file for s.th. like this? Thanks! Best regards, DJ_GoodNews.