COSQB1(3)

SYNOPSIS
SUBROUTINE COSQB1 (N, X, W, XH)

NAME
cosqb1 - Compute the unnormalized inverse of COSQF1.

LIBRARY
SLATEC (FFTPACK)

CATEGORY
J1A3

TYPE
SINGLE PRECISION (COSQB1-S)

KEYWORDS
FFTPACK, FOURIER TRANSFORM

AUTHOR
Swarztrauber, P. N., (NCAR)

DESCRIPTION
Subroutine COSQB1 computes the fast Fourier transform of quarter wave data. That is, COSQB1 computes a sequence from its representation in terms of a cosine series with odd wave numbers. The transform is defined below at output parameter X.

REFERENCES
P. N. Swarztrauber, Vectorizing the FFTs, in Parallel Computations (G. Rodrigue, ed.), Academic Press, 1982, pp. 51-83.

ROUTINES CALLED
RFFTB

REVISION HISTORY (YYMMDD)
790601 DATE WRITTEN
830401 Modified to use SLATEC library source file format.
860115 Modified by Ron Boisvert to adhere to Fortran 77 by changing dummy array size declarations (1) to (*).
881128 Modified by Dick Valent to meet prologue standards.
891214 Prologue converted to Version 4.0 format. (BAB)
920501 Reformatted the REFERENCES section. (WRB)