Set and provide defaults of controls for package nlsr
nlsr.control(control)INTEGER limit on the number of evaluations of residual function Default 10000.
CHARACTER name of the Jacobian approximation to use Default NULL, since we try to use analytic gradient
INTEGER limit on the number of evaluations of the Jacobian Default 5000
REAL initial value of the Marquardt parameter Default 0.0001 Note: mis-spelling as in JNMWS, kept as historical serendipity.
REAL multiplier used to REDUCE lambda (0 < lamdec < laminc)
Default 4, so lamda <- lamda * (lamdec/laminc)
REAL multiplier to INCREASE lambda (1 < laminc
Default 10
if stepredn > 0, then maximum number of backtrack loops (in addition to default evaluation); Default 6
REAL stepsize for numerical Jacobian approximation Default 1e-7
REAL A value used to test for numerical equality, i.e. a and
b are taken equal if (a + offset) == (b + offset)
Default 100.
REAL Factor used to add unit Marquardt stabilization matrix in Nash modification of LM method. Default 1
INTEGER The higher the value, the more intermediate output is provided. Default 0
REAL Factor used to add scaled Marquardt stabilization matrix in Nash modification of LM method. Default 0
LOGICAL If TRUE, perform (safeguarded) relative offset convergence test Default TRUE
a positive constant to be added to the denominator sum-of-squares in the relative offset convergence criteria. Default 0
LOGICAL. If TRUE tests sum of squares and terminates if very small. Default TRUE
REAL Factor used to reduce the stepsize in a Gauss-Newton algorithm (Hartley's method). 0 means NO backtrack. Default 0
LOGICAL to provide a pause at the end of each iteration for user to monitor progress. Default FALSE
A list of controls. If missing, the defaults are provided. See below. If a named control is provided, e.g., via a call ctrllist<- nlsr.control(japprox="jand"), then that value is substituted for the default of the control in the FULL list of controls that is returned.
NOTE: at 2022-6-17 there is NO CHECK FOR VALIDITY
The set of possible controls to set is as follows, and is returned.
J C Nash 2014-7-16 revised 2022-11-22 nashjc _at_ uottawa.ca