fda.usc (version 1.2.3)

fdata.deriv: Computes the derivative of functional data object.

Description

Computes the derivative of functional data.

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
Type of derivative method, for more information see details.
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".

Details

  • If method ="bspline","exponential","fourier","monomial"or"polynomial"fdata.derivfunction creates a basis to represent the functional data. The functional data are converted to classfdusing theData2fdfunction and the basis indicated in themethod. Finally, the function calculates the derivative of ordernderivof curves usingderiv.fdfunction.
  • Ifmethod="fmm","periodic","natural"or"monoH.FC"is usedsplinefunfunction.
  • Ifmethod="diff", raw derivation is applied. Not recommended to use this method when the values are not equally spaced.

See Also

See also deriv.fd, splinefun and fdata

Examples

Run this code
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))

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