KPG1_DNAG2R

Converts an NAG Hermitian Fourier transform array into an array usable by FFTPACK routine KPG1_DRFFTB

Description:

This subroutine modifies the supplied array of Fourier co-efficients (as produced by NAG subroutine C06FAF) so that an inverse FFT can be performed on them using FFTPACK routine KPG1_DRFFTB. The resulting inverse will have the same normalisation as the original data transformed using KPG1_DRFFTF.

This function is equivalent to PDA_NAG2R except that it uses work space for greater speed.

Invocation

CALL KPG1_DNAG2R( NP, R, WORK )

Arguments

NP = INTEGER (Given)
The size of the array.
R( NP ) = DOUBLE PRECISION (Given and Returned)
The array holding the Fourier co-efficients. Supplied in NAG format and returned in FFTPACK format.
WORK( NP ) = DOUBLE PRECISION (Given and Returned)
Work space.

Notes: