pframe
.
pframe(object)
pframe
, which is an object of class
data.frame
that has the added class attribute
pframe
.
Once an object is of class
pframe
, it can be given a
parameters
attribute. Parameters for the object can then be assigned values using the
parameters
or
param
functions. A
pframe
object can be attached using the
attach.pframe
function. The parameters of a pframe can be called by name just like the variables of a data frame.
A pframe may be useful, though not required, for fitting some nonlinear models with
ms
and
nls
.
# fitting Michaelis and Menten's original data conc <- c(0.3330, 0.1670, 0.0833, 0.0416, 0.0208, 0.0104, 0.0052) vel <- c(3.636, 3.636, 3.236, 2.666, 2.114, 1.466, 0.866) Micmen <- pframe(list(conc=conc, vel=vel)) class(Micmen) [1] "pframe" parameters(Micmen)<- list(K= 0.02, Vm = 3.7) fit <- nls(vel~Vm*conc/(K+conc),Micmen)