Current Point and Function Value
The current point and function value are the first two outputs of all Optimization Toolbox™ solvers.
The current point is the final point in the solver iterations. It is the best point the solver found in its run.
If you call a solver without assigning a value to the output, the default output,
ans, is the current point.
The function value is the value of the objective function at the current point.
The function value for least-squares solvers is the sum of squares, also known as the residual norm.
fsolvereturn a vector function value.
Fvaldenotes function value.