FourierDCT

FourierDCT[list]
finds the Fourier discrete cosine transform of a list of real numbers.

FourierDCT[list,m]
finds the Fourier discrete cosine transform of type m.

DetailsDetails

  • Possible types m of discrete cosine transform for a list of length giving a result are:
  • 1.DCT-I
    2.DCT-II
    3.DCT-III
    4.DCT-IV
  • FourierDCT[list] is equivalent to FourierDCT[list,2].
  • The inverse discrete cosine transforms for types 1, 2, 3, and 4 are types 1, 3, 2, and 4, respectively.
  • The list given in FourierDCT[list] can be nested to represent an array of data in any number of dimensions.
  • The array of data must be rectangular.
  • If the elements of list are exact numbers, FourierDCT begins by applying N to them.
  • FourierDCT can be used on SparseArray objects.
Introduced in 2007
(6.0)