Nonlinear Least Squares (MATLAB lsqnonlin)

Nonlinear Least Squares is explained in this video using 2 examples: GPS localization and nonlinear curve-fitting both done via the MATLAB lsqnonlin command.
MATLAB demo file can be downloaded from the following link:
drive.google.com/file/d/1lfOu...

[@danielsimion3021]

17:47 can upper and lower bounds be applied on on a subset of variables? Cause I know the constraints of only a part of the variables (x(1),x(2),x(4) for example)