Evaluate the sum of a set of functions in a functional data object.
# S3 method for fd
sum(..., na.rm)a functional data object with a single replication
that contains the sum of the functions in the object fd.
a functional data object to sum.
Not used.
Ramsay, James O., Hooker, Giles, and Graves, Spencer (2009), Functional data analysis with R and Matlab, Springer, New York.
Ramsay, James O., and Silverman, Bernard W. (2005), Functional Data Analysis, 2nd ed., Springer, New York.
Ramsay, James O., and Silverman, Bernard W. (2002), Applied Functional Data Analysis, Springer, New York.
mean.fd,
std.fd,
stddev.fd,
center.fd