Values a Two-argument Functional Data Object
eval.bifd |
Language Reference for FDA Library
|
Values a Two-argument Functional Data Object
DESCRIPTION:
A vector of argument values for the first argument
s
of the
functional data object to be evaluated.
USAGE:
eval.bifd(sevalarg, tevalarg, bifd, sLfd=0, tLfd=0)
REQUIRED ARGUMENTS:
- sevalarg
-
a vector of argument values for the first argument
s
of the
functional data object to be evaluated.
- tevalarg
-
a vector of argument values for the second argument
t
of the
functional data object to be evaluated.
- bifd
-
a two-argument functional data object.
OPTIONAL ARGUMENTS:
- sLfd
-
either a nonnegative integer or a linear differential operator object.
If present, the derivative or the value of applying the operator to
the object as a function of the first argument
s
is evaluated
rather than the functions themselves.
- tLfd
-
either a nonnegative integer or a linear differential operator object.
If present, the derivative or the value of applying the operator to
the object as a function of the second argument
t
is evaluated
rather than the functions themselves.
VALUE:
an array of 2, 3, or 4 dimensions containing the function
values. The first dimension corresponds to the argument values in sevalarg,
the second to argument values in tevalarg, the third if
present to replications, and the fourth if present to functions.
EXAMPLES:
# make temperature fd object, dont smooth
tempfd <- data2fd(tempmat, monthtime, monthbasisfd)
# define the variance-covariance bivariate fd object
tempvarbifd <- var.fd(tempfd)
# evaluate the variance-covariance surface and plot
finetime <- seq(0,12,.1)
tempvarmat <- eval.bifd(finetime,finetime,tempvarbifd)
# make a perspective plot of the variance function
persp(tempvarmat)