jaback function

jaback

approximate Jacobian via forward differences

jaback(pars, resfn = NULL, bdmsk = NULL, resbest = NULL, ndstep = 1e-07, ...)

Arguments

• pars: a named numeric vector of parameters to the model
• resfn: a function to compute a vector of residuals
• bdmsk: Vector defining bounds and masks. Default is NULL
• resbest: If supplied, a vector of the residuals at the parameters pars to save re-evaluation.
• ndstep: A tolerance used to alter parameters to compute numerical approximations to derivatives. Default 1e-7.
• ...: Extra information needed to compute the residuals

Author(s)

J C Nash 2014-7-16 nashjc at uottawa.ca