I am using simbiology for pharmacokinetics modelling. When i tried to use the non-mixed effect model using isqnonlin estimation method for fitting the data (in a two compartmental infusion model). I got the following error during fitting,
"Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 2.971666e-16"
I came across similar question being asked in context of other fields of MALTAB.
But for Simbiology, if this error occurs, how to tackle it?