#### Description:

This subroutine returns a modified version of the supplied
Fourier coefficients (as produced by NAG subroutine C06FCF). An inverse FFT can be performed on
the returned array using FFTPACK routine PDA_CFFTB, and the resulting inverse will have the same
normalisation as the original data transformed using PDA_CFFTF. See PDA_C2NAG for more details.

#### Invocation

CALL PDA_NAG2C( NP, X, Y, R )

#### Arguments

##### NP = INTEGER (Given)

The number
of points in the transform.

##### X( NP ) = REAL (Given)

The real coefficients, in NAG format.

##### Y(
NP ) = REAL (Given)

The imaginary coefficients, in NAG format.

##### R( 2, NP ) = REAL
(Returned)

The output coefficients, in FFTPACK format.

#### Implementation Status:

A double
precision version PDA_DNAG2C of the routine exists.

#### Notes:

A call to PDA_C2NAG
followed by a call to PDA_NAG2C will result in the original data being divided by NP.