fdata.deriv

0th

Percentile

Computes the derivative of functional data object.

Computes the derivative of functional data.

• If method ="bspline", "exponential", "fourier", "monomial" or "polynomial". fdata.deriv function creates a basis to represent the functional data. The functional data are converted to class fd using the Data2fd function and the basis indicated in the method. Finally, the function calculates the derivative of order nderiv of curves using deriv.fd function.

• If method="fmm", "periodic", "natural" or "monoH.FC" is used splinefun function.

• If method="diff", raw derivation is applied. Not recommended to use this method when the values are not equally spaced.

Keywords
manip
Usage
fdata.deriv(
fdataobj,
nderiv = 1,
method = "bspline",
class.out = "fdata",
nbasis = NULL,
...
)
Arguments
fdataobj

fdata class object.

nderiv

Order of derivation, by defalult nderiv=1.

method

class.out

Class of functional data returned: fdata or fd class.

nbasis

Number of Basis for fdatataobj\$DATA. It is only used if method ="bspline", "exponential", "fourier", "monomial" or "polynomial" Further arguments passed to or from other methods. Value Returns the derivative of functional data of fd class if class.out="fd" or fdata class if class.out="fdata". See Also See also deriv.fd, splinefun and fdata Aliases • fdata.deriv Examples # NOT RUN { data(tecator) absorp=tecator$absorp.fdata
tecator.fd1=fdata2fd(absorp)
tecator.fd2=fdata2fd(absorp,"fourier",9)
tecator.fd3=fdata2fd(absorp,"fourier",nbasis=9,nderiv=1)
#tecator.fd1;tecator.fd2;tecator.fd3
tecator.fdata1=fdata(tecator.fd1)
tecator.fdata2=fdata(tecator.fd2)
tecator.fdata3=fdata(tecator.fd3)
tecator.fdata4=fdata.deriv(absorp,nderiv=1,method="bspline",
class.out='fdata',nbasis=9)
tecator.fd4=fdata.deriv(tecator.fd3,nderiv=0,class.out='fd',nbasis=9)
plot(tecator.fdata4)
plot(fdata.deriv(absorp,nderiv=1,method="bspline",class.out='fd',nbasis=11))

# }

Documentation reproduced from package fda.usc, version 2.0.1, License: GPL-2

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